View source for Boeing P-8 Poseidon

{{Short description|American maritime patrol aircraft}}
{{Use dmy dates|date=November 2023}}
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{{Infobox aircraft
 |name = P-8 Poseidon
 |image = File:US Navy P-8 Poseidon taking off at Perth Airport.jpg
 |caption = A [[United States Navy]] P-8 Poseidon
 |type = [[Maritime patrol aircraft]]
 |national_origin = United States
 |manufacturer = [[Boeing]]
 |designer =
 |first_flight = 25 April 2009<ref name="first_flight">[http://www.boeing.com/news/releases/2009/q2/090426a_nr.html "Boeing P-8A Poseidon successfully completes 1st flight."] {{webarchive |url=https://web.archive.org/web/20090430135700/http://www.boeing.com/news/releases/2009/q2/090426a_nr.html |date=30 April 2009}} ''Boeing'', 27 April 2009.</ref>
 |introduction = November 2013<ref name=FI_first_production/>
 |retired =
 |status = In service
 |primary_user = [[United States Navy]] <!-- Limit one (1) primary user. -->
 |more_users = {{Ubl |[[Indian Navy]] |[[Royal Australian Air Force]] |[[Royal Air Force]]}} <!-- Limit is three (3) in 'more users' field, four (4) total users with primary user. -->
 |produced = 2009–present
 |number_built = 185 as of May 2025<ref>{{cite web |title=Orders & Deliveries |url=https://www.boeing.com/company/about-bca#orders-deliveries |website=[[Boeing]] |date=31 May 2025|access-date=10 June 2025}}</ref>
 |developed_from = [[Boeing 737 Next Generation]]
 |variants =
}}

The '''Boeing P-8 Poseidon''' is an American [[maritime patrol aircraft|maritime patrol and reconnaissance aircraft]] developed and produced by [[Boeing Defense, Space & Security]]. It was developed for the [[United States Navy]] as a derivative of the civilian [[Boeing 737 Next Generation]] airliner.

The P-8 operates in [[anti-submarine warfare]] (ASW), [[anti-surface warfare]] (ASUW), and [[ISTAR|intelligence, surveillance and reconnaissance]] (ISR) roles. It is armed with [[torpedo]]es, [[Harpoon (missile)|Harpoon anti-ship missiles]], and other weapons, can drop and monitor [[sonobuoy]]s, and can operate in conjunction with other assets, including the [[Northrop Grumman MQ-4C Triton]] maritime surveillance [[unmanned aerial vehicle]] (UAV).

In addition to the U.S. Navy, the P-8 is also operated by the [[Indian Navy]], the [[Royal Australian Air Force]], the United Kingdom's [[Royal Air Force]], the [[Republic of Korea Navy]], the [[Royal Norwegian Air Force]], the [[Royal New Zealand Air Force]] and the [[German Navy]]. It also has been ordered by the [[Republic of Singapore Air Force]] and the [[Royal Canadian Air Force]].

==Development==

===Origins===
The [[Lockheed P-3 Orion]], a turboprop ASW aircraft, had been in service with the United States Navy (USN) since 1962.<ref name="USNavyFactFile">{{Cite web |date=18 February 2009 |title=P-3C Orion long range ASW aircraft |url=http://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1400&ct=1 |archive-url=https://web.archive.org/web/20110316155749/http://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1400&ct=1 |archive-date=16 March 2011 |website=Navy.mil}}</ref> In the 1980s, the USN began studies for a P-3 replacement, the range and endurance of which were reduced due to increasing weight and airframe fatigue life limitations. The specification required a new aircraft to have reduced operating and support costs. In 1989, Lockheed was awarded a fixed-price contract to develop the [[Lockheed P-7|P-7]], but this was canceled the following year.<ref>{{blist |{{Cite magazine |last=Bailey |first=John |date=1–7 August 1990 |title=Lockheed loses to Survive |url=http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%202126.html |url-status=dead |magazine=[[Flight International]] |location=Sutton, Surrey, England |publisher=[[Reed Elsevier|Reed Business Publishing Group]] |volume=138 |page=20 |issn=0015-3710 |archive-url=https://web.archive.org/web/20150213054153/http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%202126.html |archive-date=13 February 2015 |via=[[FlightGlobal]] |number=4227}} |{{Cite magazine |last=Bailey |first=John |date=1–7 August 1990 |title=Lockheed loses to Survive |url=http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%202127.html |url-status=dead |magazine=[[Flight International]] |location=Sutton, Surrey, England |publisher=[[Reed Elsevier|Reed Business Publishing Group]] |volume=138 |page=21 |issn=0015-3710 |archive-url=https://web.archive.org/web/20150213063624/http://www.flightglobal.com/pdfarchive/view/1990/1990%20-%202127.html |archive-date=13 February 2015 |access-date=27 March 2014 |via=[[FlightGlobal]] |number=4227}}}}</ref>

In 2000, a second competition for a replacement began. [[Lockheed Martin]] submitted the [[Lockheed P-3 Orion#Variants|Orion 21]], an updated new-build version of the P-3.<ref>[https://web.archive.org/web/20100201033005/http://www.flug-revue.rotor.com/FRTypen/FR737MMA.htm "Boeing 737 MMA."] ''Flug Revue'', 17 June 2004.</ref> Boeing's proposal was based on its [[Boeing 737 Next Generation#737-800|737-800]] airliner.<ref>Cortes, Lorenzo and Amy Butler. [http://findarticles.com/p/articles/mi_6712/is_52_222/ai_n29104857/ "Boeing wins Navy's $3.88 Billion MMA bid over Lockheed Martin."] ''Defense Daily,'' 15 June 2004.</ref>  [[BAE Systems]] offered a new-build version of the [[BAE Systems Nimrod MRA4|Nimrod MRA4]], a British jet-powered maritime patrol aircraft. BAE withdrew from the competition in October 2002, recognizing that without a production partner based in the United States, the bid was politically unrealistic.<ref>{{Cite magazine |last=Lewis |first=Paul |date=8 October 2002 |title=BAE pulls out of MMA competition; Lack of US partner prompts Nimrod MRA4 withdrawal |url=http://www.flightglobal.com/articles/2002/10/08/155930/bae-pulls-out-of-mma-competition.html |magazine=[[Flight International]] |page=5 |archive-url=https://web.archive.org/web/20200531172251/https://www.flightglobal.com/articles/2002/10/08/155930/bae-pulls-out-of-mma-competition.html |archive-date=31 May 2020}}</ref> On 14 May 2004, Boeing was selected as the winner of the ''Multimission Maritime Aircraft'' program.<ref name="boeing_20040514">LeMond-Holman, Ellen et al. [http://www.boeing.com/news/releases/2004/q2/nr_040614n.html "Boeing team wins $3.89 Billion multi-mission Maritime Aircraft Program."] {{webarchive |url=https://web.archive.org/web/20040618043226/http://www.boeing.com/news/releases/2004/q2/nr_040614n.html |date=18 June 2004}} ''Boeing'', 14 May 2004.</ref>

In June 2004, the USN awarded a development contract to Boeing.<ref>[http://www.navy.mil/search/display.asp?story_id=13759 "Boeing to develop Navy's multi-mission maritime aircraft."] {{Webarchive|url=https://web.archive.org/web/20110604042431/http://www.navy.mil/search/display.asp?story_id=13759 |date=4 June 2011}} ''U.S. Navy,'' 15 June 2004.</ref> The project was planned to be for at least 108 airframes for the USN.<ref name=P-8_Navy_fact_file/>  Project value is expected to be worth at least $15&nbsp;billion. [[Raytheon]], [[Northrop Grumman]], [[Spirit AeroSystems]], [[GE Aviation Systems]], [[Marshall Aerospace and Defence Group]], [[CFM International]], BAE Systems, and [[Marotta]] were the major subcontractors.<ref>Lemond, Ellen, Chick Ramey and Debiie Gann. [http://www.boeing.com/defense-space/military/p8a/news/2007/q4/071212c_nr.html "Boeing-led Poseidon team begins production of first P-8A fuselage."] {{Webarchive|url=https://web.archive.org/web/20081007032710/http://www.boeing.com/defense-space/military/p8a/news/2007/q4/071212c_nr.html |date=7 October 2008}} ''Boeing'', 12 December 2007.</ref> In July 2004, the USN placed an order for five aircraft, with the first flight-test aircraft to be completed in 2009.<ref name="P-8_Navy_fact_file">[http://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 "P-8A multi-mission maritime aircraft (MMA)."] {{Webarchive|url=https://web.archive.org/web/20070711021443/https://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 |date=11 July 2007}} ''U.S. Navy,'' 17 February 2009.</ref> On 30 March 2005, it was assigned the P-8A designation.<ref>Hatcher, Renee. [http://www.navair.navy.mil/index.cfm?fuseaction=home.PrintNewsStory&id=3157 "MMA is designated P-8A."] {{Webarchive|url=https://web.archive.org/web/20120320063336/http://www.navair.navy.mil/index.cfm?fuseaction=home.PrintNewsStory&id=3157 |date=20 March 2012}} ''U.S. Navy Naval Air Systems Command (NAVAIR)'', 1 April 2005.</ref>

===Design phase and testing===
[[File:Boeing P-8A rollout 30 July 2009.jpg|thumb|The rollout of the P-8 on 30 July 2009]]

The P-8 is to replace the P-3.<ref>Freedberg, Sydney J. Jr. [https://archive.today/20121129154712/http://defense.aol.com/2012/10/02/navys-p-8-sub-hunter-bets-on-high-altitude-high-tech-barf-bag/?icid=related3 "Navy's P-8 Sub Hunter Bets On High Altitude, High Tech; Barf Bags Optional."] ''AOL Defense,'' 2 October 2012.</ref> Initially, it was equipped with legacy systems with later upgrades to incorporate newer technology. The [[Government Accountability Office]] credited the incremental approach with keeping the project on schedule and on budget. The [[Naval Air Systems Command]] (NAVAIR) deleted the requirement for the P-8A to be equipped with [[magnetic anomaly detector|magnetic anomaly detection]] (MAD) equipment as a weight reduction measure, improving endurance. A hydrocarbon sensor detects fuel vapors from diesel-powered submarines and ships.<ref>[https://www.gao.gov/products/gao-09-326sp GAO-09-326SP "Assessments of major weapon programs."] {{Webarchive|url=https://web.archive.org/web/20090830120009/http://www.gao.gov/htext/d09326sp.html |date=30 August 2009}} ''GAO''.</ref>

The P-8's first flight was on 25 April 2009.<ref name=first_flight/> The second and third P-8s had flown and were in flight testing in early August 2010.<ref name="T3_first_flight">Ramey, Chick and Doug Abbotts. [http://boeing.mediaroom.com/index.php?s=43&item=1360 "Boeing P-8A Poseidon aircraft T3 enters flight test."] {{Webarchive|url=https://web.archive.org/web/20111015190040/http://boeing.mediaroom.com/index.php?s=43&item=1360 |date=15 October 2011}} ''Boeing'', 2 August 2010.</ref> On 11 August 2010, [[low rate initial production|low-rate production]] of the P-8 was approved.<ref>{{Cite magazine |last=Trimble |first=Stephen |date=13 August 2010 |title=Boeing P-8A approved to launch production |url=http://www.flightglobal.com/news/articles/boeing-p-8a-approved-to-launch-production-346153/ |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20120309051255/http://www.flightglobal.com/news/articles/boeing-p-8a-approved-to-launch-production-346153/ |archive-date=9 March 2012 |via=[[FlightGlobal]]}}</ref><ref>[http://www.airforcesmonthly.com/view_news.asp?ID=2422 "P-8A Poseidon milestone reached."] {{Webarchive|url=https://web.archive.org/web/20101120030024/http://airforcesmonthly.com/view_news.asp?ID=2422 |date=20 November 2010}} ''AirForces Monthly'', 13 August 2010.</ref> A P-8 released [[sonobuoy]]s for the first time on 15 October 2010, dropping six in three separate low-altitude passes.<ref>Goettee, Liz. [http://blog.seattlepi.com/aerospace/2010/10/22/u-s-navy-boeing-p-8a-poseidon-launches-first-sonobuoys/ "U.S. Navy Boeing P-8A Poseidon launches first sonobuoys."] {{Webarchive|url=https://web.archive.org/web/20110712145043/http://blog.seattlepi.com/aerospace/2010/10/22/u-s-navy-boeing-p-8a-poseidon-launches-first-sonobuoys/ |date=12 July 2011}} ''Seattle Post-Intelligencer'', 22 October 2010.</ref> In 2011, the ice detection system was found to be defective due to the use of [[Unapproved aircraft part|counterfeit components]]; allegedly these parts were poorly refurbished and sold to subcontractor BAE Systems as new by a Chinese supplier.<ref>Reed, John. {{usurped|1=[https://web.archive.org/web/20140320224804/http://defensetech.org/2011/11/08/counterfeit-parts-found-on-new-p-8-posiedons/ "Counterfeit Parts found on the P-8."]}} ''defensetech.org,'' 8 November 2011.</ref>

[[File:P 8 and P 3 over Pax River.jpg|thumb|A P-8A flying alongside a Lockheed [[P-3C Orion]], close to [[Naval Air Station Patuxent River]], Maryland, 2010]]
On 4 March 2012, the first production P-8A was delivered to the USN, flying to [[Naval Air Station Jacksonville]], Florida, for training with the Fleet Replacement Squadron (FRS), [[VP-30|Patrol Squadron 30 (VP-30)]].<ref name="FI_first_production">{{Cite magazine |last=Majumdar |first=Dave |date=8 March 2012 |title=Picture: Boeing delivers first production P-8A |url=http://www.flightglobal.com/news/articles/picture-boeing-delivers-first-production-p-8a-369279/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20120311083514/http://www.flightglobal.com/news/articles/picture-boeing-delivers-first-production-p-8a-369279/ |archive-date=11 March 2012 |via=[[FlightGlobal]] |url-access=subscription}}</ref> On 24 September 2012, Boeing announced a $1.9 billion (~${{Format price|{{Inflation|index=US-GDP|value=1900000000|start_year=2012}}}} in {{Inflation/year|US-GDP}}) order for 11 aircraft.<ref>[http://boeing.mediaroom.com/index.php?s=43&item=2425 "Boeing Receives $1.9 Billion Contract for 11 P-8A Poseidon Aircraft."] {{Webarchive|url=https://web.archive.org/web/20121002053345/http://boeing.mediaroom.com/index.php?s=43&item=2425 |date=2 October 2012}} ''Boeing'', 24 September 2012.</ref> On 10 June 2013, a [[U.S. Department of Defense]] (DoD) Inspector General (IG) report recommended delaying full-rate production over a lack of key data to assess if the P-8 met operational requirements; additional tests were also needed to guarantee a 25-year lifespan.<ref>{{usurped|1=[https://web.archive.org/web/20130828092620/http://defensetech.org/2013/06/12/pentagon-ig-p-8-poseidon-needs-critical-testing/ Audit: Submarine Hunter Needs 'Critical' Testing]}}&nbsp;– Defensetech.org, 12 July 2013</ref> Boeing executives dismissed the report, saying that the test program was on track.<ref>{{usurped|1=[https://web.archive.org/web/20130724021415/http://defensetech.org/2013/06/17/boeing-dismisses-pentagons-p-8-poseidon-audit/ Boeing Dismisses Pentagon's P-8 Poseidon Audit]}}&nbsp;– Defensetech.org, 17 June 2013</ref> In 2013, full-rate production was delayed until the P-8 could demonstrate it can survive its 25-year lifespan without structural fatigue, overcome deficiencies, track surface ships, and perform primary missions.<ref>McGarry, Brendan. [http://www.dodbuzz.com/2013/08/06/navy-p-8-deal-tops-17-billion-in-july-awards/ "Navy P-8 Deal Tops $17 Billion in July Awards."] {{Webarchive|url=https://web.archive.org/web/20130807040036/http://www.dodbuzz.com/2013/08/06/navy-p-8-deal-tops-17-billion-in-july-awards/ |date=7 August 2013}} ''Dodbuzz.com'', 6 August 2013.</ref>

On 24 June 2013, during weapons integration testing, the P-8 achieved a milestone by firing a live [[Harpoon (missile)|AGM-84 Harpoon]] anti-ship missile and scored a direct hit on a low-cost modular target.<ref>{{Cite magazine |date=9 July 2013 |title=P-8 Poseidon fires first Harpoon anti-ship missile |url=http://www.flightglobal.com/news/articles/p-8-poseidon-fires-first-harpoon-anti-ship-missile-388093/ |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130715080047/http://www.flightglobal.com/news/articles/p-8-poseidon-fires-first-harpoon-anti-ship-missile-388093/ |archive-date=15 July 2013 |via=[[FlightGlobal]]}}</ref> On 1 July 2013, an initial operational test and evaluation (IOT&E) report found that the P-8A was "operationally effective, operationally suitable, and ready for fleet introduction." Six test and nine [[Low rate initial production|low-rate initial production]] aircraft had been delivered at that point.<ref name="ready">{{Cite magazine |last=Majumdar |first=Dave |date=9 July 2013 |title=P-8A judged ready for fleet introduction |url=http://www.flightglobal.com/news/articles/p-8a-judged-ready-for-fleet-introduction-388072/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130713110344/http://www.flightglobal.com/news/articles/p-8a-judged-ready-for-fleet-introduction-388072/ |archive-date=13 July 2013 |via=[[FlightGlobal]] |url-access=subscription}}</ref> On 31 July 2013, Boeing received a $2.04 billion contract to build 13 P-8As in the fourth low-rate initial production lot, for a fleet of 37 aircraft by the end of 2016, and long-lead parts for 16 P-8As of the first full-rate production lot.<ref>{{Cite magazine |last=Trimble |first=Stephen |date=1 August 2013 |title=Boeing receives $2bn contract to build 13 P-8As |url=http://www.flightglobal.com/news/articles/boeing-receives-2bn-contract-to-build-13-p-8as-389015/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130805221027/http://www.flightglobal.com/news/articles/boeing-receives-2bn-contract-to-build-13-p-8as-389015/ |archive-date=5 August 2013 |via=[[FlightGlobal]] |url-access=subscription}}</ref>

In January 2014, Naval Air Systems Command proceeded with full-rate production of the P-8A. Increment 1 systems include persistent [[anti-submarine warfare]] (ASW) capabilities and an integrated sensor suite; in 2016, Increment 2 upgrades will add multi-static active coherent acoustics, an automated identification system, and high-altitude anti-submarine weapons.<ref>[http://www.navytimes.com/article/20140127/NEWS04/301270042/Troubled-P-8A-Poseidon-enters-full-production Troubled P-8A Poseidon enters full production] Navytimes.com, 27 January 2014.</ref> Increment 3 in 2020 shall enable "net-enabled anti-surface warfare".<ref>{{Cite news |last=Norris |first=Guy |date=24 April 2014 |title=Increasing P-8A Capability |work=[[Aviation Week & Space Technology]] |publisher=[[Penton (company)|Penton]] |url=http://www.aviationweek.com/Blogs.aspx?plckController=Blog&plckScript=blogScript&plckElementId=blogDest&plckBlogPage=BlogViewPost&plckPostId=Blog%3a27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3a95b53201-728f-43c6-9a22-b3d3e49934ec |url-status=live |archive-url=https://web.archive.org/web/20140424204410/http://www.aviationweek.com/Blogs.aspx?plckController=Blog&plckScript=blogScript&plckElementId=blogDest&plckBlogPage=BlogViewPost&plckPostId=Blog%3a27ec4a53-dcc8-42d0-bd3a-01329aef79a7Post%3a95b53201-728f-43c6-9a22-b3d3e49934ec |archive-date=24 April 2014}}</ref>

In July 2014, Fred Smith, business development director for the P-8, noted that the program had: "saved $2.1 billion on 2004 estimates of the cost of production... the aircraft is now selling for $150 million, down from the forecasted $216 million".<ref>{{Cite news |date=15 July 2014 |title=Boeing Sees UK C-17 Lease as Model for P-8 |work=[[Defense News]] |url=http://archive.defensenews.com/article/20140715/SHOWSCOUT15/307150034/Boeing-Sees-UK-C-17-Lease-Model-P-8}}{{dead link|date=August 2021|bot=medic}}{{cbignore|bot=medic}}</ref> The halving of USN orders from 16 aircraft per year down to eight in 2015 due to the expiration of the [[Bipartisan Budget Act of 2013]] was expected to be partially offset by commercial 737 sales and P-8 export sales.<ref>{{Cite magazine |last=Hemmerdinger |first=Jon |date=9 April 2014 |title=Reduced P-8 buy to affect price, not fleet plan |url=http://www.flightglobal.com/news/articles/reduced-p-8-buy-to-affect-price-not-fleet-plan-398009/ |url-status=live |magazine=[[Flight International]] |publisher=[[RELX|Reed Business Information]] |archive-url=https://web.archive.org/web/20140411160923/http://www.flightglobal.com/news/articles/reduced-p-8-buy-to-affect-price-not-fleet-plan-398009/ |archive-date=11 April 2014 |via=[[FlightGlobal]]}}</ref> The DoD wanted to follow a program template for the P-8 similar to the [[Joint Strike Fighter Program|Joint Strike Fighter]] (JSF) program, with international cooperation from prospective users.<ref>{{Cite web |last=Baglole |first=Joel |date=7 June 2011 |title=P-8 Poseidon: Future aircraft of the U.S. Navy |url=http://usmilitary.about.com/od/antisubmarine/a/poseidon.htm |archive-url=https://web.archive.org/web/20110710034936/http://usmilitary.about.com/od/antisubmarine/a/poseidon.htm |archive-date=10 July 2011 |website=About.com}}</ref>

===Derivatives===
In 2010, Boeing proposed to replace the [[United States Air Force]]'s (USAF) [[Northrop Grumman E-8 Joint STARS|E-8 Joint STARS]] fleet with a modified P-8 at the same cost Northrop Grumman proposed for re-engining and upgrading the E-8s.<ref name="pitches">{{Cite magazine |last=Trimble |first=Stephen |date=18 February 2010 |title=Boeing pitches P-8 variant to replace JSTARS |url=http://www.flightglobal.com/articles/2010/02/18/338619/boeing-pitches-p-8-variant-to-replace-jstars.html |url-status=dead |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20100308155924/http://www.flightglobal.com/articles/2010/02/18/338619/boeing-pitches-p-8-variant-to-replace-jstars.html |archive-date=8 March 2010 |via=[[FlightGlobal]]}}</ref> The proposed P-8 Airborne Ground Surveillance (AGS) would integrate an [[active electronically scanned array]] (AESA) radar, and have ground moving target indicator (GMTI) and [[synthetic aperture radar]] (SAR) capabilities. A key feature was a pod-mounted radar on the fuselage's lower centerline, positioned so the engine nacelles do not obstruct its line of sight. It reuses the P-8A's Raytheon [[AN/APY-10]] multi-mission surface search radar. Two aft ventral fins increase stability.<ref name="pitches" /><ref name="PI_looks_to_sell">Cohen, Aubrey. [http://www.seattlepi.com/business/article/Boeing-looks-to-sell-more-737-based-military-jets-1417659.php#photo-1043466 "Boeing looks to sell more 737-based military jets."] {{Webarchive|url=https://web.archive.org/web/20150824082917/http://www.seattlepi.com/business/article/Boeing-looks-to-sell-more-737-based-military-jets-1417659.php#photo-1043466 |date=24 August 2015}} ''Seattle PI'', 9 June 2011.</ref>

In 2013, Boeing proposed repackaging some of the P-8's systems in the smaller and less expensive [[Bombardier Challenger 600 series]] business jet, as the [[Boeing Maritime Surveillance Aircraft]] (MSA).<ref name="CASR201307">{{Cite web |date=July 2013 |title=Maritime Surveillance Aircraft: Boeing selects a Bombardier 'Bizjet', the Challenger 605, as the preferred airframe for its proposed MSA |url=http://www.casr.ca/ai-boeing-msa-challenger.htm |url-status=dead |archive-url=https://web.archive.org/web/20130923070241/http://www.casr.ca/ai-boeing-msa-challenger.htm |archive-date=23 September 2013 |website=[[Canadian American Strategic Review]]}}</ref> In 2014, Boeing also offered a JSTARS replacement based on the [[Boeing 737 Next Generation#737-700|737-700]], rather than the P-8's 737-800.<ref>[https://archive.today/20140913152429/http://www.defensenews.com/article/20140912/DEFREG02/309120026/Boeing-Eyes-737-700-Solution-New-JSTARS Boeing Eyes 737-700 Solution for New JSTARS]&nbsp;– Defensenews.com, 12 September 2014</ref>

==Design==
[[File:Lt. Levi Ellis, left and Lt. Bradley Woods pilot a P-8A Poseidon assigned to Patrol Squadron (VP) 47 as part of a sinking exercise (SINKEX). (48842239491).jpg|thumb|US Navy pilots in the cockpit of a P-8 in 2019]]

The P-8 is a 737-800ERX, roughly similar to the 737-800 commercial passenger aircraft and the USN's 737-700-based [[Boeing C-40 Clipper|C-40 Clipper]] transport aircraft, but with several modifications to make it suitable for its military service role. Many of the changes reflect the need for the aircraft to operate at lower altitudes and be capable of more aggressive maneuvering than a commercial aircraft. However, the changes were kept in line with the existing assembly process. Boeing 737 [[fuselage]] builder [[Spirit AeroSystems]] added structural strength to the airframe, while adding a short [[bomb bay]] for torpedoes and other stores behind the wing.<ref name="p8 bravado" />

The aircraft is assembled at the [[Boeing Renton Factory]] with the stronger wings from the 737-900.<ref name="Boeing_P-8A_Specs" /> The aircraft uses [[raked wingtips]] similar to those fitted to the [[Boeing 767#767-400ER|Boeing 767-400ER]], instead of the [[Wingtip device#Blended winglets|blended winglets]] available on 737NG variants.<ref>{{Cite magazine |last=Warwick |first=Graham |date=7 June 2005 |title=New MMA wingtips combat icing |url=http://www.flightglobal.com/news/articles/new-mma-wingtips-combat-icing-198887/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20150119014146/http://www.flightglobal.com/news/articles/new-mma-wingtips-combat-icing-198887/ |archive-date=19 January 2015 |access-date=12 September 2012 |via=[[FlightGlobal]] |url-access=subscription}}</ref> To combat icing on the raked wingtips, horizontal stabilizers and vertical stabilizers, the aircraft is outfitted with [[Ice protection system#Electro-mechanical|electro-mechanical expulsion deicing systems]].<ref name="p8 bravado" /> In the cockpit, changes were made to the flight control and alerting systems, allowing for an increased [[bank angle]], a more responsive [[autothrottle]], and the elimination of [[Ground proximity warning system|audible warnings]] during low-altitude operations.<ref name="p8 bravado" /> In order to power additional onboard electronics, the P-8 has a 180&nbsp;kVA electric generator on each [[CFM International CFM56]] engine, replacing the 90&nbsp;kVA generator of civilian 737s; this required the redesigning of the nacelles and their wing mountings.<ref name="p8 bravado">{{Cite magazine |last=Croft |first=John |date=26 April 2010 |title=CUTAWAY: P-8A Poseidon&nbsp;– A Boeing with boost of bravado |url=http://www.flightglobal.com/news/articles/cutaway-p-8a-poseidon-a-boeing-with-boost-of-bravado-340955/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130309021953/http://www.flightglobal.com/news/articles/cutaway-p-8a-poseidon-a-boeing-with-boost-of-bravado-340955/ |archive-date=9 March 2013 |access-date=10 March 2013 |via=[[FlightGlobal]] |url-access=subscription}}</ref> The Navy says that compared to the P-3, the P-8 has a smoother flight experience, subjecting crews to less turbulence and fumes, allowing them to concentrate better on missions.<ref>[http://breakingdefense.com/2012/10/navys-p-8-sub-hunter-bets-on-high-altitude-high-tech-barf-bag/ Navy's P-8 Sub Hunter Bets On High Altitude, High Tech; Barf Bags Optional] {{Webarchive |url=https://web.archive.org/web/20150908005341/http://breakingdefense.com/2012/10/navys-p-8-sub-hunter-bets-on-high-altitude-high-tech-barf-bag/ |date=8 September 2015}}&nbsp;– Breakingdefense.com, 2 October 2012</ref>

[[File:U.S. Navy helps search for Malaysia Airlines flight MH370.jpg|thumb|Crew at work stations inside a P-8]]
After the aircraft roll off the assembly line, five operator stations (two [[Naval Flight Officer|naval flight officers]] plus three enlisted Aviation Warfare Operators/naval aircrewman) are mounted in a sideways row, along the port side of the cabin. Other than one large window on each side of the forward cabin for two observers, none of the other crew stations have windows.<ref name="p8 bravado" /> A short bomb bay for torpedoes and other stores opens behind the wing. The P-8 is to be equipped with the High-Altitude Anti-Submarine Warfare Weapon Capability (HAAWC) Air Launch Accessory (ALA), turning a [[Mark 54 Lightweight Torpedo|Mark 54 torpedo]] into a [[glide bomb]] for deploying from up to {{convert|30000|ft|m|abbr=on}}.<ref name="mad drone">[http://www.militaryaerospace.com/articles/2015/01/bae-subhunting-drone.html BAE Systems to develop MAD ASW drone to help Navy P-8A find submarines from high altitudes] {{Webarchive|url=https://web.archive.org/web/20150119023109/http://www.militaryaerospace.com/articles/2015/01/bae-subhunting-drone.html |date=19 January 2015}}. Militaryaerospace.com, 14 January 2015.</ref>

The P-8 features the Raytheon APY-10 multi-mission surface search radar.<ref name="Raytheon_APY-10">[http://www.raytheon.com/capabilities/products/apy10/ "AN/APY-10 maritime, littoral and overland surveillance radar."] {{Webarchive|url=https://web.archive.org/web/20121010202724/http://www.raytheon.com/capabilities/products/apy10/|date=10 October 2012}} ''Raytheon'', 2011.</ref> Unlike the preceding P-3, most versions of the P-8 lack a [[magnetic anomaly detector]] (MAD), but the P-8I is equipped with a MAD at India's request.<ref>[http://www.businessinsider.com/how-the-navys-latest-anti-submarine-aircraft-sees-under-the-waves-2014-11 How The Navy's Latest Anti-Submarine Aircraft Sees Under The Waves] {{Webarchive|url=https://web.archive.org/web/20150921182631/http://www.businessinsider.com/how-the-navys-latest-anti-submarine-aircraft-sees-under-the-waves-2014-11|date=21 September 2015}}&nbsp;– Businessinsider.com, 27 November 2014</ref> Various sensor data are combined via [[data fusion]] software to track targets.<ref>{{Cite web |title=Boeing: P-8A Poseidon |url=http://www.boeing.com/boeing/defense-space/military/p8a/ |url-status=live |archive-url=https://web.archive.org/web/20141103122506/http://www.boeing.com/boeing/defense-space/military/p8a/ |archive-date=3 November 2014 |access-date=19 November 2014 |website=boeing.com}}</ref> Following the cancellation of Lockheed Martin's [[Aerial Common Sensor]] project, Boeing proposed a signals intelligence variant of the P-8 for the USN's requirement.<ref name="fi_20060126">{{Cite magazine |last=Wastnage |first=Justin |date=26 January 2006 |title=Boeing unveils new 737 signals intelligence concept |url=http://www.flightglobal.com/news/articles/boeing-unveils-new-737-signals-intelligence-concept-204338/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130922235633/http://www.flightglobal.com/news/articles/boeing-unveils-new-737-signals-intelligence-concept-204338/ |archive-date=22 September 2013 |access-date=12 September 2012 |via=[[FlightGlobal]]}}</ref> During the P-8A Increment 2 upgrade in 2016, the [[Littoral Surveillance Radar System]] (LSRS) will be replaced by the [[Advanced Airborne Sensor]] radar.<ref name="aas 2014">[http://defense-update.com/20140417_boeing-p-8a-begins-advanced-airborne-sensor-testing.html#.VfXzUDeFOM8 Boeing P-8A Begins Advanced Airborne Sensor Testing] {{Webarchive|url=https://web.archive.org/web/20150917144234/http://defense-update.com/20140417_boeing-p-8a-begins-advanced-airborne-sensor-testing.html#.VfXzUDeFOM8|date=17 September 2015}}&nbsp;– Defense-Update.com, 17 April 2014</ref>

In U.S. service, the P-8A is complemented by the [[Northrop Grumman MQ-4C Triton|MQ-4C Triton]] unmanned aerial vehicle (UAV) which provides continuous surveillance. In January 2015, BAE Systems was awarded a contract for the USN's High Altitude ASW (HAASW) Unmanned Targeting Air System (UTAS) program to develop a sub-hunting UAV equipped with a MAD for launching from the P-8.<ref name="mad drone" />

[[File:Searches the water for debris on a P-8A Poseidon during a mission to assist in search and rescue operations for Malaysia Airlines flight MH370 March 20 140320-N-XY761-105.jpg|thumb|Naval aircrewman at one of the two large observer's windows, the only crew stations with windows.]]
The P-8 cannot use the Navy's typical [[probe and drogue]] in-flight refueling method, instead using a [[flying boom]] receptacle on the upper-forward fuselage, making it, like the USN's [[E-6 Mercury]] aircraft, reliant on US Air Force (USAF) [[KC-135 Stratotanker]], [[KC-10 Extender]] and [[KC-46 Pegasus]] aircraft for in-flight refueling. In April 2017, the USAF [[459th Air Refueling Wing]] worked with the Naval Air Systems Command to certify operationally the P-8 for in-flight refueling.<ref name="P8Refueling">{{Cite web |last=Justen, Tech. Sgt. |first=Kat |date=21 April 2017 |title=Air Force, Navy conduct first P-8A refueling mission |url=https://www.amc.af.mil/News/Article-Display/Article/1160924/air-force-navy-conduct-first-p-8a-refueling-mission/ |url-status=live |archive-url=https://web.archive.org/web/20180808171507/https://www.amc.af.mil/News/Article-Display/Article/1160924/air-force-navy-conduct-first-p-8a-refueling-mission/ |archive-date=8 August 2018 |access-date=19 September 2018 |website=Air Mobility Command}}</ref> For extended endurance, the P-8 is equipped with six auxiliary fuel tanks.<ref>{{Cite web |last=Osborn |first=Kris |date=4 January 2022 |title=The Navy's P-8 Poseidon Is America's Perfect Submarine Hunter |url=https://nationalinterest.org/blog/reboot/navys-p-8-poseidon-americas-perfect-submarine-hunter-198942 |access-date=27 November 2023 |website=The National Interest |language=en |archive-date=28 November 2023 |archive-url=https://web.archive.org/web/20231128172000/https://nationalinterest.org/blog/reboot/navys-p-8-poseidon-americas-perfect-submarine-hunter-198942 |url-status=live}}</ref>

==Operational history==

===United States===
In February 2012, the P-8 made its mission debut during "[[Bold Alligator]]" 2012, an annual littoral warfare exercise.<ref>{{Cite news |last=Cavas |first=Christopher P. |date=7 February 2012 |title=P-8A makes debut in 'Bold Alligator' exercise |work=[[Navy Times]] |url=http://www.navytimes.com/news/2012/02/dn-p8a-makes-debut-in-bold-alligator-exercise-020712/ |url-status=dead |archive-url=https://archive.today/20120905020732/http://www.navytimes.com/news/2012/02/dn-p8a-makes-debut-in-bold-alligator-exercise-020712/ |archive-date=5 September 2012}}</ref> In April 2012, it took part in [[Exercise Joint Warrior]], flying out of [[RAF Lossiemouth]].<ref>Crowther, Stuart. [http://local.stv.tv/forres/news/armed-forces/35815-senior-raf-officer-reveals-mod-may-be-considering-nimrod-replacement/ "Senior RAF officer reveals MoD may be considering Nimrod replacement."] {{Webarchive|url=https://web.archive.org/web/20120424230608/http://local.stv.tv/forres/news/armed-forces/35815-senior-raf-officer-reveals-mod-may-be-considering-nimrod-replacement/ |date=24 April 2012}} ''STV Local'', 18 April 2012.</ref> During [[RIMPAC]] 2012 in the Hawaiian area, two P-8As participated in 24 scenarios as part of Air Test and Evaluation Squadron One ([[Operational Test and Evaluation Force|VX-1]]) while forward deployed to [[Marine Corps Base Hawaii]].<ref>[http://www.navy.mil/submit/display.asp?story_id=68678 "VX-1 flies P-8 Poseidon during RIMPAC 2012 (NNS120729-04)."] {{Webarchive|url=https://web.archive.org/web/20120730065028/http://www.navy.mil/submit/display.asp?story_id=68678 |date=30 July 2012}} ''RIMPAC Public Affairs'', 29 July 2012.</ref> On 29 November 2013, its inaugural deployment began when six aircraft and 12 air crews of squadron [[VP-16]] departed its home station of NAS Jacksonville, Florida, for [[Kadena Air Base]] in Okinawa, Japan.<ref name="InauguralDeployment">{{Cite news |date=27 November 2013 |title=Poseidon's inaugural deployment starts Friday |work=[[Navy Times]] |url=http://www.navytimes.com/article/20131127/NEWS04/311270015/Poseidon-s-inaugural-deployment-starts-Friday}}</ref> This deployment was a pre-planned regional re-balancing action, but occurred shortly after China's establishment of the [[Air Defense Identification Zone (East China Sea)|East China Sea Air Defense Identification Zone]], heightening tensions.<ref>{{Cite web |date=13 June 2023 |title=Find The Best Latest News & Website Reviews on dodbuzz.com |url=https://dodbuzz.com/ |access-date=13 June 2023 |language=en-US |archive-date=4 October 2011 |archive-url=https://web.archive.org/web/20111004144026/http://www.dodbuzz.com/2008/06/30/gates-opposed-af-plans-to-deploy-f-22-to-iraq/ |url-status=live}}</ref>

During early exercises and the Japanese deployment, the P-8 reportedly suffered radar, sensor integration, and data transfer problems, leading to more testing. In 2012–3, the US government's [[Director, Operational Test and Evaluation]] (DOTE) evaluated the P-8A Increment 1, and reported that it was effective for small-area and cued ASW search, localization and attack missions, but lacked the [[P-3C]]'s broad-area ASW acoustic search capability; the Mk 54 torpedoes were of limited use against evasive targets. The P-8A was also effective at ASuW search, detection and classification in all-weather at short to medium ranges for all surface vessels and at longer ranges for larger vessels, yet was not effective for Intelligence, Surveillance and Reconnaissance mission due to various issues including no high-resolution SAR capability. It did have better range, speed, and reliability than older aircraft.<ref>{{Cite web |last=Cenciotti |first=David |date=25 January 2014 |title=The Navy's $35-Billion Surveillance Plane Has Lots of Flaws |url=https://medium.com/war-is-boring/2c946d0d8535 |url-status=live |archive-url=https://web.archive.org/web/20140202194116/https://medium.com/war-is-boring/2c946d0d8535 |archive-date=2 February 2014 |website=[[Medium (website)|Medium]]}}</ref><ref>{{Cite web |title=P-8A Poseidon Multi-Mission Maritime Aircraft |url=https://www.dote.osd.mil/Portals/97/pub/reports/FY2013/navy/2013p8aposeidon.pdf?ver=2019-08-22-111216-330 |url-status=live |archive-url=https://web.archive.org/web/20220808025058/https://www.dote.osd.mil/Portals/97/pub/reports/FY2013/navy/2013p8aposeidon.pdf?ver=2019-08-22-111216-330 |archive-date=8 August 2022 |access-date=21 July 2022 |publisher=[[Director, Operational Test and Evaluation]]}}</ref> DOTE concluded that it was not deployment ready.<ref>{{Cite news |last=Capaccio |first=Tony |date=23 January 2014 |title=Boeing Surveillance Plane Not Yet Effective, U.S. Tester Finds |work=[[Bloomberg Businessweek]] |publisher=[[Bloomberg L.P.]] |url=http://www.businessweek.com/news/2014-01-23/boeing-surveillance-plane-found-not-yet-effective-for-missions |url-status=dead |archive-url=https://web.archive.org/web/20140706033758/http://www.businessweek.com/news/2014-01-23/boeing-surveillance-plane-found-not-yet-effective-for-missions |archive-date=6 July 2014}}</ref> Pentagon acquisition undersecretary [[Frank Kendall]] said of the report that, although its findings are factual, it ignored future capability upgrades for ASW and surveillance.<ref>{{Cite news |date=28 January 2014 |title=Top Weapons Buyer Disputes P-8 Testing Woes |work=[[Military.com]] |url=http://www.dodbuzz.com/2014/01/28/dods-top-weapons-buyer-disputes-p-8-audit/ |archive-url=https://web.archive.org/web/20140129154445/http://www.dodbuzz.com/2014/01/28/dods-top-weapons-buyer-disputes-p-8-audit/ |archive-date=29 January 2014}}</ref>

A second squadron, [[VP-5]], completed its transition to the P-8 in August 2013.<ref name=InauguralDeployment/> During mid-2014, a pair of P-8s were dispatched to [[Perth, Australia]] for two months for an international search for the missing [[Malaysia Airlines Flight 370]].<ref>{{Cite news |last=Schogol |first=Jeff |date=13 March 2014 |title=Navy adjusts effort in search for missing Malaysian airliner |work=[[Navy Times]] |publisher=[[Gannett Government Media]] |url=http://www.navytimes.com/article/20140313/NEWS08/303130027/Navy-adjusts-effort-search-missing-Malaysian-airliner}}</ref> On 2 October 2015, USN P-8s stationed at Naval Air Station Jacksonville, Florida, alongside U.S. Coast Guard [[HC-144A Ocean Sentry]], [[Lockheed HC-130#USCG HC-130H|HC-130H]] and USAF Reserve [[Lockheed HC-130#USAF HC-130P Combat Shadow|HC-130P Combat Shadow]] aircraft, searched the Eastern Caribbean Sea for the missing [[SS El Faro]] cargo ship that sank on 1 October in the Category 3 [[Hurricane Joaquin]] near Crooked Island in the [[Bahamas]].<ref>Ashley Halsey III, [https://www.washingtonpost.com/local/trafficandcommuting/navy-finds-ship-that-sank-near-bahamas-in-hurricane-joaquin/2015/11/02/0e824e3c-8195-11e5-9afb-0c971f713d0c_story.html "Navy finds ship that sank near Bahamas in Hurricane Joaquin"] {{Webarchive|url=https://web.archive.org/web/20180405091952/https://www.washingtonpost.com/local/trafficandcommuting/navy-finds-ship-that-sank-near-bahamas-in-hurricane-joaquin/2015/11/02/0e824e3c-8195-11e5-9afb-0c971f713d0c_story.html |date=5 April 2018}}, ''[[The Washington Post]]'', 2 November 2015.</ref> On 20 February 2018, a P-8 of [[VP-8|Patrol Squadron Eight (VP-8)]] rescued three [[fisherman|fishermen]] whose vessel had been adrift in the South [[Pacific Ocean]] for eight days, deploying a search and rescue (SAR) kit containing supplies and communications equipment, the first time that a P-8 deployed a SAR kit in a real operation.<ref>{{Cite news |last=Tatchio |first=Danielle |date=21 February 2018 |title=VP-8 Fighting Tigers Rescue Fishermen Lost at Sea for 8 Days in South Pacific |language=en |url=https://www.navy.mil/Press-Office/Press-Briefings/display-pressbriefing/Article/2250585/vp-8-fighting-tigers-rescue-fishermen-lost-at-sea-for-8-days-in-south-pacific/ |url-status=live |archive-url=https://web.archive.org/web/20180527201824/http://www.navy.mil/submit/display.asp?story_id=104438 |archive-date=27 May 2018}}</ref>

On 19 August 2014, a Chinese [[Shenyang J-11]] fighter came within {{convert|30|ft}} of a USN P-8A of VP-5 about {{convert|135|mi}} east of [[Hainan Island]] while patrolling the [[South China Sea dispute|South China Sea]]. The J-11 flew past the P-8's nose and performed a [[barrel roll]] at close proximity.<ref>{{Cite news |last=Whitlock |first=Craig |date=22 August 2014 |title=Pentagon: China tried to block U.S. military jet in dangerous mid-air intercept |newspaper=The Washington Post |url=https://www.washingtonpost.com/world/national-security/pentagon-china-tried-to-block-us-military-jet-in-dangerous-mid-air-intercept/2014/08/22/533d24e8-2a1b-11e4-958c-268a320a60ce_story.html |url-status=live |archive-url=https://web.archive.org/web/20140822230704/http://www.washingtonpost.com/world/national-security/pentagon-china-tried-to-block-us-military-jet-in-dangerous-mid-air-intercept/2014/08/22/533d24e8-2a1b-11e4-958c-268a320a60ce_story.html |archive-date=22 August 2014}}</ref> A Pentagon spokesperson said the J-11's unit had made close intercepts earlier that year.<ref>{{Cite news |last1=Burns |first1=Robert |last2=Baldor |first2=Lolita C. |date=22 August 2014 |title=Pentagon Cites 'Dangerous' Chinese Jet Intercept |work=ABC News |agency=Associated Press |url=https://abcnews.go.com/Politics/wireStory/pentagon-cites-dangerous-chinese-jet-intercept-25086587 |url-status=live |archive-url=https://web.archive.org/web/20140826160836/https://abcnews.go.com/Politics/wireStory/pentagon-cites-dangerous-chinese-jet-intercept-25086587 |archive-date=26 August 2014}}</ref> The U.S. sent a diplomatic note to China about the behavior of the Chinese fighter group's commander.<ref>{{Cite magazine |last=Lubold |first=Gordon |date=22 August 2014 |title=Call Sign 'Rogue': Pentagon Says One Chinese Commander Responsible for Spate of Air Confrontations |url=http://complex.foreignpolicy.com/posts/2014/08/22/call_sign_rogue_pentagon_says_one_chinese_commander_responsible_for_spate_of_air_co |url-status=dead |magazine=Foreign Policy |archive-url=https://web.archive.org/web/20140826041946/http://complex.foreignpolicy.com/posts/2014/08/22/call_sign_rogue_pentagon_says_one_chinese_commander_responsible_for_spate_of_air_co |archive-date=26 August 2014}}</ref> China stated that the claims were "totally groundless", and that the root cause was U.S. surveillance of China.<ref>{{Blist |{{Cite news |date=23 August 2014 |title=China urges U.S. to stop close-in surveillance |publisher=Xinhua News Agency |url=http://news.xinhuanet.com/english/china/2014-08/23/c_133578974.htm |url-status=dead |archive-url=https://web.archive.org/web/20140823154936/http://news.xinhuanet.com/english/china/2014-08/23/c_133578974.htm |archive-date=23 August 2014}} |{{Cite news |last=Hutzler |first=Charles |date=23 August 2014 |title=Beijing Denies Fighter Flew Dangerously Close to U.S. Patrol Plane |work=The Wall Street Journal & Company, Inc. |url=https://www.wsj.com/articles/china-denies-fighter-flew-dangerously-close-to-u-s-patrol-plane-1408810331 |url-status=live |archive-url=https://web.archive.org/web/20170826124110/https://www.wsj.com/articles/china-denies-fighter-flew-dangerously-close-to-u-s-patrol-plane-1408810331 |archive-date=26 August 2017}}}}</ref> In November 2016, a Russian [[Su-30]] fighter intercepted a P-8 over the [[Black Sea]], coming within {{convert|5|ft}} of it, forcing the P-8 through its [[Wake turbulence|jet wash]], causing "a 15-degree roll and violent turbulence".<ref>{{Cite web |last1=Browne |first1=Ryan |last2=Cohen |first2=Zachary |date=29 January 2018 |title=Russian jet flies within 5 feet of US Navy plane, Pentagon says |url=https://www.cnn.com/2018/01/29/politics/russia-jet-us-navy-black-sea/index.html |url-status=live |archive-url=https://web.archive.org/web/20180129180821/http://www.cnn.com/2018/01/29/politics/russia-jet-us-navy-black-sea/index.html |archive-date=29 January 2018 |access-date=29 January 2018 |publisher=CNN}}</ref>

[[File:20190401 P-8 Poseidon Tail 169327 Kadena AB-115.jpg|thumb|A US Navy P-8 landing at [[Kadena AB]]]]
USN P-8s routinely rotate through bases of allies.<ref>Shalal-Esa, Andrea and Eveline Danubrata. [https://www.reuters.com/article/us-usa-navy-asia-idUSTRE7BF04Y20111216 "U.S. Navy may station ships in Singapore, Philippines."] {{Webarchive|url=https://web.archive.org/web/20150924161134/http://www.reuters.com/article/2011/12/16/us-usa-navy-asia-idUSTRE7BF04Y20111216 |date=24 September 2015}} ''Reuters'', 16 December 2011.</ref>  In September 2014, the Malaysian government offered the use of bases in [[East Malaysia]] for P-8s, but no flights have yet been approved.<ref>[http://in.reuters.com/article/malaysia-usa-spyplanes-idINKBN0H72DD20140912 "U.S. says Malaysia offers to host spy planes that irk China"] {{Webarchive|url=https://web.archive.org/web/20140914061820/http://in.reuters.com/article/2014/09/12/malaysia-usa-spyplanes-idINKBN0H72DD20140912 |date=14 September 2014}}. Reuters, 13 September 2014.</ref> On 7 December 2015, P-8s were deployed to Singapore as part of a Defense Cooperation Agreement between the US and Singapore for "fighting terrorism and piracy."<ref>{{Cite web |date=7 December 2015 |title=US to deploy Poseidon spy plane amid South China Sea territory tensions |url=https://www.theguardian.com/us-news/2015/dec/07/us-p8-poseidon-spy-plane-territory-tensions-south-china-sea |url-status=live |archive-url=https://web.archive.org/web/20160824170343/https://www.theguardian.com/us-news/2015/dec/07/us-p8-poseidon-spy-plane-territory-tensions-south-china-sea |archive-date=24 August 2016 |website=The Guardian}}</ref> China criticized the Singapore deployment as "regional militarization by the U.S."<ref>[https://thediplomat.com/2015/12/china-decries-us-p-8-deployment-in-singapore-as-regional-militarization/ "China Decries US P-8 Deployment in Singapore as 'Regional Militarization'."] {{Webarchive|url=https://web.archive.org/web/20151209201509/https://thediplomat.com/2015/12/china-decries-us-p-8-deployment-in-singapore-as-regional-militarization/ |date=9 December 2015}} ''The Diplomat'', 9 December 2015.</ref> The third detachment of two P-8s based in [[Paya Lebar Air Base]], Singapore, participated in naval military drills with the Singapore Armed Forces (SAF) in mid 2016.<ref>{{Cite web |last=Post |first=The Jakarta |title=US spy planes deployed in Singapore till next month for exercises |url=http://www.thejakartapost.com/seasia/2016/07/31/us-spy-planes-deployed-in-singapore-till-next-month-for-exercises.html |url-status=live |archive-url=https://web.archive.org/web/20160801200540/http://www.thejakartapost.com/seasia/2016/07/31/us-spy-planes-deployed-in-singapore-till-next-month-for-exercises.html |archive-date=1 August 2016}}</ref>

On 20 November 2023, a USN P-8A assigned to [[VP-4]]<ref>{{Cite magazine |url=https://aviationweek.com/awin/program/1174 |title=Program Profile Boeing P-8 |magazine= [[Aviation Week & Space Technology]] |access-date= 9 December 2023 |url-access= subscription |quote=In November, 2023, a P-8A assigned to VP-4 taking-off from MCAS Kaneohe Bay in Oahu, Hawaii, overshot the runway and entered the water. The aircraft sustained visible damage to the radome but the aircraft was deemed to be structurally intact and could possibly be returned to service.}}</ref> [[2023 Boeing P-8 Poseidon runway overrun|overshot the runway]] while landing in the rain at [[MCAS Kaneohe Bay]] and ended up in the water. None of the nine crew on board were injured.<ref>{{Cite news |date=21 November 2023 |title=U.S. Navy plane overshoots runway and goes into Kaneohe Bay |url=https://www.staradvertiser.com/2023/11/20/breaking-news/military-u-s-navy-plane-overshoots-runway-and-goes-into-kaneohe-bay/ |newspaper=[[Honolulu Star-Advertiser]] |language=en |url-access=subscription |access-date=3 December 2023 |archive-date=1 December 2023 |archive-url=https://web.archive.org/web/20231201093011/https://www.staradvertiser.com/2023/11/20/breaking-news/military-u-s-navy-plane-overshoots-runway-and-goes-into-kaneohe-bay/ |url-status=live}}</ref><ref>{{cite web |title=US Navy says it will cost $1.5M to salvage jet plane that crashed on Hawaii coral reef |url=https://apnews.com/article/hawaii-navy-plane-crash-21386573f057722eab68b89e094f551a |website=AP News |publisher=[[Associated Press]] |date=2 December 2023 |language=en |access-date=3 December 2023 |archive-date=2 December 2023 |archive-url=https://web.archive.org/web/20231202235357/https://apnews.com/article/hawaii-navy-plane-crash-21386573f057722eab68b89e094f551a |url-status=live}}</ref> The USN hopes to repair the aircraft and return it to operational status.<ref>{{Cite web |url=https://www.flightglobal.com/fixed-wing/Fus-navy-hopes-to-restore-crashed-hawaii-p-8-to-flight-status/155991.article |title=US Navy hopes to restore crashed Hawaii P-8 to flight status |date=27 November 2023 |first1=Ryan |last1=Finnerty |work=[[FlightGlobal]] |url-access=subscription |access-date=10 December 2023 |archive-date=11 January 2024 |archive-url=https://web.archive.org/web/20240111025526/https://www.flightglobal.com/fixed-wing/us-navy-hopes-to-restore-crashed-hawaii-p-8-to-flight-status/155991.article |url-status=live}}</ref> The aircraft was floated and pulled from the sea on 2 December 2023.<ref>{{Cite web |url=https://www.flightglobal.com/defence/us-navy-hauls-p-8a-from-the-sea-in-hawaii/156091.article |title=US Navy hauls P-8A from the sea in Hawaii |date=4 December 2023 |first1=Greg |last1=Waldron |work=[[FlightGlobal]] |url-access=subscription |access-date=10 December 2023 |archive-date=4 December 2023 |archive-url=https://web.archive.org/web/20231204054145/https://www.flightglobal.com/defence/us-navy-hauls-p-8a-from-the-sea-in-hawaii/156091.article |url-status=live}}</ref> The USN later determined that restoring the aircraft was not cost-effective and subsequently scrapped it.<ref>{{Cite web |url=https://modernengineeringmarvels.com/2025/07/31/why-the-navy-chose-to-scrap-a-180-million-poseidon-and-what-it-means-for-the-fleet/ |title=Why the Navy Chose to Scrap a $180 Million Poseidon and What It Means for the Fleet |first1=Charles |last1=Mitchell |date=31 July 2025 |work=Modern Engineering Marvels}}</ref>

A USN P-8A flew through the [[Taiwan Strait]] on 17 April 2024, asserting navigational rights amid tensions with China over Taiwan's sovereignty. This followed the first talks between US and Chinese defense chiefs since 2022, aimed at easing regional tensions.<ref>{{cite news |first1=Christopher |last1=Bodeen |publisher=[[Associated Press]] |date=17 April 2024 |title=US navy flies aircraft through the Taiwan Strait a day after US-China defense chiefs hold rare talks |url=https://apnews.com/article/us-china-taiwan-strait-flight-ea835c8b35b63a50b5354a5dc9280116 |archive-url=https://web.archive.org/web/20240417132030/https://apnews.com/article/us-china-taiwan-strait-flight-ea835c8b35b63a50b5354a5dc9280116 |archive-date=17 April 2024 |access-date=17 April 2024}}</ref>

===India===
[[File:Boeing P-8I of the Indian Navy.jpg|thumb|An Indian Navy P-8I in flight]]
In January 2008, Boeing proposed the P-8I, a customized export variant of the P-8A, for the [[Indian Navy]].<ref>Pandit, Rajat. [https://timesofindia.indiatimes.com/india/India-eyes-2b-defence-deal-with-US/articleshow/2738886.cms "India eyes $2b defence deal with US."] ''The Times of India'', 29 January 2008.</ref> The P-8I has a version of the [[Raytheon]] [[AN/APY-10|APY-10]] multi-mission surface search radar that meets export requirements.<ref name="Raytheon export">[http://theasiandefence.blogspot.com/2010/07/raytheon-to-develop-international.html "Raytheon to develop international version of APY-10 radar for P-8I."] {{Webarchive|url=https://web.archive.org/web/20110830191330/http://theasiandefence.blogspot.com/2010/07/raytheon-to-develop-international.html|date=30 August 2011}} ''Theasiandefence.blogspot.com'', 18 July 2010. Retrieved: 13 March 2011.</ref> It also features two components not fitted on the P-8A, a [[Telephonics Corporation|Telephonics]] APS-143 OceanEye aft radar and a [[magnetic anomaly detector]] (MAD).<ref name="sp31m14">{{Cite news |title=Indian Navy pleased with P-8I performance on first op deployment |work=SP's Aviation |url=http://www.sps-aviation.com/exclusive/?id=283&q=Indian-Navy-pleased-with-P%968I-performance-on-first-op-deployment |url-status=live |access-date=2 April 2014 |archive-url=https://web.archive.org/web/20140407080956/http://www.sps-aviation.com/exclusive/?id=283&q=Indian-Navy-pleased-with-P%968I-performance-on-first-op-deployment |archive-date=7 April 2014}}</ref> The P-8I also features multiple Indian-origin components which include [[Bharat Electronics Limited]] (BEL) Data Link II communication suite, BEL-developed [[Identification friend or foe|IFF]] Interrogator system, Avantel [[mobile satellite service]] (MSS)<ref name=":0">{{Cite news |date=2011-12-27 |title=Avantel hands over mobile satellite service systems to Boeing |url=https://www.business-standard.com/article/companies/avantel-hands-over-mobile-satellite-service-systems-to-boeing-111122700024_1.html |url-status=live |archive-url=https://web.archive.org/web/20250911155842/https://www.business-standard.com/article/companies/avantel-hands-over-mobile-satellite-service-systems-to-boeing-111122700024_1.html |archive-date=2025-09-11 |access-date=2025-09-11 |work=[[Business Standard]]}}</ref> and [[Electronics Corporation of India Limited]] (ECIL) speech secrecy system. The Data Link II will allow the P-8I to exchange tactical data between [[Indian Naval Air Arm|Indian Navy]] aircraft, ships and shore establishments. These systems will be integrated in [[Boeing Renton Factory]].<ref name=":1">{{Cite web |date=2010-12-23 |title=BEL supplies P-8I aircraft equipment to Boeing |url=http://www.thehindu.com/news/national/article971992.ece |archive-url=https://web.archive.org/web/20101227005650/http://www.thehindu.com/news/national/article971992.ece |archive-date=2010-12-27 |access-date=2025-09-11 |website=[[The Hindu]] |language=en}}</ref><ref name=":2">{{Cite news |date=2010-12-23 |title=BEL supplies P-8I aircraft equipment to Boeing |url=https://economictimes.indiatimes.com/industry/transportation/airlines-/-aviation/bel-supplies-p-8i-aircraft-equipment-to-boeing/articleshow/7150520.cms?from=mdr |url-status=live |archive-url=https://web.archive.org/web/20250911160259/https://economictimes.indiatimes.com/industry/transportation/airlines-/-aviation/bel-supplies-p-8i-aircraft-equipment-to-boeing/articleshow/7150520.cms?from=mdr |archive-date=2025-09-11 |access-date=2025-09-11 |work=The Economic Times |issn=0013-0389}}</ref><ref name=":3">{{Cite web |date=2010-05-12 |title=Indian-designed Data Link II delivered to Boeing |url=https://www.business-standard.com/article/economy-policy/indian-designed-data-link-ii-delivered-to-boeing-110051200137_1.html |url-status=live |archive-url=https://web.archive.org/web/20250911161318/https://www.business-standard.com/article/economy-policy/indian-designed-data-link-ii-delivered-to-boeing-110051200137_1.html |archive-date=2025-09-11 |access-date=2025-09-11 |website=[[Business Standard]]}}</ref>

==== First contract ====
On 1 January 2009, India's [[Ministry of Defence (India)|Ministry of Defence]] signed a US$2.1&nbsp;billion (~${{Format price|{{Inflation|index=US-GDP|value=2100000000|start_year=2009}}}} in {{Inflation/year|US-GDP}}) agreement with Boeing for eight P-8Is to replace the Indian Navy's aging [[Tupolev Tu-142]]M maritime surveillance turboprops. The contract was signed after negotiations and clearance for the same from the [[Cabinet Committee on Security]] (CCS). While the P-8I contract was a direct agreement with Boeing, some end-user verifications are yet to be clarified with the [[US Government]].<ref name="TOI090105">{{Cite news |last=Pandit |first=Rajat |date=2009-01-05 |title=India inks largest-ever defence deal with US |url=https://timesofindia.indiatimes.com/india/india-inks-largest-ever-defence-deal-with-us/articleshow/3934357.cms |url-status=live |archive-url=https://web.archive.org/web/20130514213438/http://articles.timesofindia.indiatimes.com/2009-01-05/india/28045146_1_vivek-lall-boeing-p-8i-defence-deal |archive-date=2013-05-14 |access-date=2025-09-12 |work=The Times of India |issn=0971-8257}}</ref> Boeing will deliver the first of eight P-8I aircraft within 48 months of contract signing.<ref name=":1" /><ref name=":2" /> The agreement included an additional purchase of four aircraft through [[Option (finance)|Option Clause]].<ref name=":6">{{Cite press release |title=Boeing Begins Final Assembly of India's 1st P-8I Aircraft |date=2011-06-21 |publisher=[[Boeing]] |url=https://boeing.mediaroom.com/2011-06-21-Boeing-Begins-Final-Assembly-of-Indias-1st-P-8I-Aircraft |access-date=2025-09-11 |url-status=live |archive-url=https://web.archive.org/web/20250911172057/https://boeing.mediaroom.com/2011-06-21-Boeing-Begins-Final-Assembly-of-Indias-1st-P-8I-Aircraft |archive-date=2025-09-11}}</ref><ref name=":4">{{Cite press release |title=Boeing P-8I Aircraft Completes 1st Flight |date=2011-09-29 |publisher=[[CFM International]] |url=https://www.cfmaeroengines.com/press-articles/boeing-p-8i-aircraft-completes-1st-flight |access-date=2025-09-11}}</ref> It was Boeing's first military sale to India and the P-8's first international customer.<ref name="Boeing_sell_8_P-8Is">Ratnam, Gopal and Edmond Lococo. [https://www.bloomberg.com/apps/news?pid=20601103&sid=aSj3PxUZAebM&refer=us "Boeing to sell eight reconnaissance planes to India."] {{Webarchive|url=https://web.archive.org/web/20230313153931/https://www.bloomberg.com/tosv2.html?vid=&uuid=3f4ae7e0-c1b5-11ed-88d8-456a76497672&url=L3BvbGl0aWNzP3BpZD0yMDYwMTEwMyZyZWZlcj11cyZzaWQ9YVNqM1B4VVpBZWJN |date=13 March 2023}} ''Bloomberg,'' 6 January 2009.</ref>

India has purchased 21 [[Harpoon (missile)|AGM-84L Harpoon Block II missiles]] and 32 [[Mark 54 lightweight torpedo|Mark 54 Lightweight Torpedoes]] All-Up-Round for the P-8I.<ref>[http://www.indiastrategic.in/topstories1877_Indian_Navy_gets_most_sophisticated_system_in_P8-I_maritime_aircraft.htm "Indian Navy gets its most sophisticated system yet in P8-I Maritime Aircraft"] {{Webarchive|url=https://web.archive.org/web/20130501152303/http://indiastrategic.in/topstories1877_Indian_Navy_gets_most_sophisticated_system_in_P8-I_maritime_aircraft.htm |date=1 May 2013}}. India Strategic, January 2013.</ref><ref>{{cite web |date=2011-06-28 |title=US clears sale of anti-submarine torpedoes to Indian Navy |url=http://www.indianexpress.com/news/us-clears-sale-of-antisubmarine-torpedoes-to-indian-navy/809957/ |url-status=live |archive-url=https://archive.today/20130126151516/http://www.indianexpress.com/news/us-clears-sale-of-antisubmarine-torpedoes-to-indian-navy/809957/ |archive-date=26 January 2013 |access-date=29 June 2011 |website=The Indian Express}}</ref><ref>{{Cite web |date=21 December 2010 |title=India – AGM-84L Harpoon Block II Missiles |url=https://www.dsca.mil/press-media/major-arms-sales/india-agm-84l-harpoon-block-ii-missiles |url-status=live |archive-url=https://web.archive.org/web/20210326191707/https://www.dsca.mil/press-media/major-arms-sales/india-agm-84l-harpoon-block-ii-missiles |archive-date=26 March 2021 |access-date=5 January 2024 |website=Defense Security Cooperation Agency}}</ref>

In April 2010, BEL delivered the first Data Link II systems to Boeing a month ahead of schedule. BEL was contracted to supply them in August 2009 and is expected to complete the delivery by late 2011.<ref name=":3" /><ref>{{Cite web |date=2010-05-12 |title=Boeing to use BEL designed Datalink-II {{!}} Siasat |url=http://www.siasat.com/english/news/boeing-use-bel-designed-datalink-ii |archive-url=https://web.archive.org/web/20110716071707/http://www.siasat.com/english/news/boeing-use-bel-designed-datalink-ii |archive-date=2011-07-16 |access-date=2025-09-11 |website=www.siasat.com}}</ref> In December 2010, BEL supplied its IFF Interrogator system to Boeing.<ref name=":1" /><ref name=":2" /> On 26 December 2011, Avantel delivered 12 sets of their MSS-based communication systems to Boeing, at a cost of $1.8&nbsp;million, for the Indian Navy's P-8I programme. The system had been examined and approved by the [[CEMILAC]].<ref name=":0" />

The production of first P-8I [[fuselage]] began on 7 December 2010 at [[Spirit AeroSystems]] facility in [[Wichita, Kansas]] with the production of a bonded aluminum panel which would be fitted to the fuselage's upper lobe to support an antenna. This marked the progress of the programme from the design phase to production phase.<ref>{{Cite press release |title=Boeing Team Begins Building Indian Navy's 1st P-8I Aircraft |date=2010-12-07 |publisher=[[CFM International]] |url=https://www.cfmaeroengines.com/press-articles/boeing-team-begins-building-indian-navys-1st-p-8i-aircraft |access-date=2025-09-11}}</ref><ref>{{Cite news |last=McMillan |first=Mollie |date=2010-12-07 |title=Spirit AeroSystems begins building first P-8I for Indian navy |url=https://www.kansas.com/news/local/news-columns-blogs/article1049609.html |access-date=2025-09-11 |work=Kansas}}</ref> The fuselage was then delivered to Boeing Renton Facility for final assembly line on 29 May 2011. The installation of wings and engines followed. The final assembly begun by 21 June 2011.<ref name=":6" /><ref name=":5">{{Cite web |date=2012-07-13 |title="Боинг" начал программу летных испытаний первого самолета БПА Р-8I "Нептун" ВМС Индии |url=http://flotprom.ru/news/?ELEMENT_ID=117296 |archive-url=https://web.archive.org/web/20131011012934/http://flotprom.ru/news/?ELEMENT_ID=117296 |archive-date=2013-10-11 |access-date=2025-09-11 |website=flotprom.ru |language=ru}}</ref>

On 29 September 2011, the first P-8I completed its initial flight from [[Boeing Field]]. The aircraft took off at 12:02&nbsp;pm local time and landed after a two hour and 31 minute long sortie. Multiple airborne systems checks including engine accelerations & decelerations and autopilot flight modes were conducted before the aircraft was take to an altitude of up to {{Convert|41000|ft|abbr=on}}. Boeing would now begin mission systems installation and checkout work on this aircraft at its Renton facility.<ref name=":4" /> In July 2012, Boeing conducted another P-8I flight testing from the same airfield. The sortie was 3 hours 49 minutes long where the aircraft fulfilled all its requirements. Further flight testing would be conducted in a US Navy range in the [[Neah Bay, Washington]] and a joint US-Canadian range. The first aircraft was expected to be delivered by January 2013 followed by the remaining units by 2016.<ref name=":5" />

On 19 December 2012, the first P-8I was handed over to an Indian naval team at Boeing's facility. When the first three aircraft will be delivered, all of these will flown to India at once. The delivery of the other five would be completed by 2015.<ref name=":7" /> It was inducted into the Indian Navy on 15 May 2013 at {{INS|Rajali}} in [[Tamil Nadu]].<ref>{{Cite news |date=2013-05-15 |title=Navy inducts Boeing Poseidon-8I to tighten coastal security |url=https://timesofindia.indiatimes.com/india/Navy-inducts-Boeing-Poseidon-8I-to-tighten-coastal-security/articleshow/20064989.cms |access-date=2025-09-11 |work=The Times of India |issn=0971-8257}}</ref> The second aircraft was delivered on 15 November 2013. Meanwhile, the first aircraft completed its weapons trials by the Indian Navy which included firing a Harpoon anti-ship missile and dropping a torpedo. The aircraft's acceptance trials was still underway while the same for the second aircraft will now commence within months.<ref>{{Cite press release |title=Boeing Delivers 2nd P-8I Maritime Patrol Aircraft to India |date=2013-11-15 |publisher=[[Boeing]] |url=https://boeing.mediaroom.com/Boeing-Delivers-2nd-P-8I-Maritime-Patrol-Aircraft-to-India |access-date=2025-09-11 |url-status=live |archive-url=https://web.archive.org/web/20250911173817/https://boeing.mediaroom.com/Boeing-Delivers-2nd-P-8I-Maritime-Patrol-Aircraft-to-India |archive-date=2025-09-11}}</ref><ref name="hin16n">{{Cite news |date=16 November 2013 |title=Indian Navy receives second P8I maritime patrol aircraft |work=The Hindu |location=Chennai, India |url=http://www.thehindu.com/news/national/indian-navy-receives-second-p8i-maritime-patrol-aircraft/article5357776.ece |url-status=live |archive-url=https://web.archive.org/web/20131119033714/http://www.thehindu.com/news/national/indian-navy-receives-second-p8i-maritime-patrol-aircraft/article5357776.ece |archive-date=19 November 2013}}</ref>

==== Optional clause contract ====
In October 2010, the Defence Acquisition Council (DAC), under the [[Ministry of Defence (India)|Indian Ministry of Defence]], approved the purchase of four additional P-8Is.<ref>{{Cite press release |title=Year-end review–2010 (Indian Navy) |date=2010-12-28 |publisher=[[Press Information Bureau]] |url=http://pib.nic.in/newsite/erelease.aspx?relid=68744 |access-date=2025-09-12 |archive-url=https://web.archive.org/web/20120901201354/http://pib.nic.in/newsite/erelease.aspx?relid=68744 |archive-date=2012-09-01}}</ref> As of December 2012, the negotiations for four P-8I was underway. This would add to the capability to the highest of Indian Navy's three-tier maritime surveillance grid.<ref name=":7">{{Cite news |date=2012-12-20 |title=Navy gets first long-range maritime reconnaissance aircraft |url=https://timesofindia.indiatimes.com/india/Navy-gets-first-long-range-maritime-reconnaissance-aircraft/articleshow/17685604.cms |access-date=2025-09-11 |work=The Times of India |issn=0971-8257}}</ref> On 1 July 2016, the Cabinet Committee on Security (CCS) cleared the procurement worth around $1.1&nbsp;billion. The deal would be signed within few days while the first aircraft was to be delivered within 50 months or three years of signing the contract.<ref>{{Cite news |date=2016-07-02 |title=PM oks $1bn deal with US for 4 Poseidons |url=https://timesofindia.indiatimes.com/india/PM-oks-1bn-deal-with-US-for-4-Poseidons/articleshow/53015224.cms |url-status=live |archive-url=https://web.archive.org/web/20250912071752/https://timesofindia.indiatimes.com/india/PM-oks-1bn-deal-with-US-for-4-Poseidons/articleshow/53015224.cms |archive-date=2025-09-12 |access-date=2025-09-12 |work=The Times of India |issn=0971-8257}}</ref> The deal was finally signed on 27 July 2016.<ref name=":8">{{Cite news |date=2016-07-27 |title=India inks another $1 billion deal for 4 US planes |url=https://www.timesnownews.com/business-economy/companies/article/india-inks-another-1-billion-deal-for-4-us-planes/46900 |url-status=live |archive-url=https://web.archive.org/web/20250912065933/https://www.timesnownews.com/business-economy/companies/article/india-inks-another-1-billion-deal-for-4-us-planes/46900 |archive-date=2025-09-12 |access-date=2025-09-12 |language=en}}</ref><ref>{{Cite news |date=2016-07-27 |title=India inks another $1 billion deal for 4 sub-hunting planes with the US |url=https://timesofindia.indiatimes.com/india/india-inks-another-1-billion-deal-for-4-sub-hunting-planes-with-the-us/articleshow/53415644.cms |access-date=2025-09-12 |work=The Times of India |issn=0971-8257}}</ref>

The first was delivered to Indian naval air station {{INS|Hansa}}, [[Dabolim]], [[Goa]] on 19 November 2020,<ref>[https://timesofindia.indiatimes.com/city/goa/navys-latest-p-8i-aircraft-makes-quiet-touch-down-at-ins-hansa/articleshow/79290914.cms Navy's latest P-8I aircraft makes quiet touch down at INS Hansa] {{Webarchive|url=https://web.archive.org/web/20220108113058/https://timesofindia.indiatimes.com/city/goa/navys-latest-p-8i-aircraft-makes-quiet-touch-down-at-ins-hansa/articleshow/79290914.cms|date=8 January 2022}} Times of India, 19 November 2020</ref> followed by the second on 13 July 2021,<ref>[https://www.financialexpress.com/defence/another-p8i-from-boeing-lands-in-goa-will-boost-indian-navys-maritime-reconnaissance-capabilities/2289220/ Another P8i from Boeing lands in Goa! Will boost Indian Navy's Maritime Reconnaissance Capabilities] {{Webarchive |url=https://web.archive.org/web/20210713130639/https://www.financialexpress.com/defence/another-p8i-from-boeing-lands-in-goa-will-boost-indian-navys-maritime-reconnaissance-capabilities/2289220/|date=13 July 2021}} Financial Express 13 July 2021</ref> the third on 18 October 2021<ref>{{Cite web |last=Vavasseur |first=Xavier |date=2021-10-18 |title=Boeing Delivers 11th P-8I Neptune MPA to Indian Navy |url=https://www.navalnews.com/naval-news/2021/10/boeing-delivers-11th-p-8i-neptune-mpa-to-indian-navy/ |access-date=2025-09-12 |website=Naval News |language=en-US}}</ref> and the last on 23 February 2022.<ref>{{Cite news |date=2022-02-24 |title=Boeing delivers 12th P-8I maritime patrol aircraft to Indian Navy |url=https://economictimes.indiatimes.com/news/defence/boeing-delivers-12th-p-8i-maritime-patrol-aircraft-to-indian-navy/articleshow/89795896.cms?from=mdr |access-date=2025-09-12 |work=The Economic Times |issn=0013-0389}}</ref> The last two aircraft arrived at the air station on 30 December 2021. The aircraft was welcomed by a [[MiG-29K]] formation. This marked the maiden operation of P-8I from the air station.<ref>{{Cite press release |title=P-8I aircraft commence operations from INS Hansa |date=2022-04-01 |publisher=[[Press Information Bureau]] |url=https://www.pib.gov.in/PressReleasePage.aspx?PRID=1787617 |access-date=2025-09-12}}</ref><ref>{{Cite web |last=Vavasseur |first=Xavier |date=2022-01-04 |title=Indian Navy's P-8I Neptune MPA Commence Operations from INS Hansa |url=https://www.navalnews.com/naval-news/2022/01/indian-navys-p-8i-neptune-mpa-commence-operations-from-ins-hansa/ |url-status=live |archive-url=https://web.archive.org/web/20220106064853/https://www.navalnews.com/naval-news/2022/01/indian-navys-p-8i-neptune-mpa-commence-operations-from-ins-hansa/ |archive-date=2022-01-06 |access-date=2025-09-12 |website=Naval News |language=en-US}}</ref> The second squadron of P-8I based at Hansa, [[INAS 316]] ''Condors'', was commissioned on 29 March 2022. During its commissioning, the [[commanding officer]] was [[Commander]] Amit Mohapatra. The squadron will employ the four aircraft received as part of the Option Clause contract.<ref>{{Cite press release |title=Commissioning Ceremony of INAS 316 on 29 March 2022 |date=29 March 2022 |publisher=indiannavy.gov.in |url=https://indiannavy.gov.in/content/p-8i |access-date=12 September 2025}}</ref><ref>{{Cite web |date=2022-03-30 |title=Indian Navy commissioned the 2nd P-8I squadron |url=https://www.navalnews.com/naval-news/2022/03/indian-navy-commissioned-the-2nd-p-8i-squadron/ |access-date=2025-09-11 |website=Naval News |language=en-US}}</ref><ref>{{Cite news |last=Peri |first=Dinakar |date=2022-03-29 |title=Navy commissions second P-8I squadron INAS 316 'Condors' in Goa |url=https://www.thehindu.com/news/national/navy-commissions-second-p-8i-squadron-inas-316-condors-in-goa/article65271151.ece |access-date=2025-09-11 |work=The Hindu |language=en-IN |issn=0971-751X}}</ref>

In April 2020, DSCA approved the sale of 10 [[AGM-84 Harpoon|AGM-84L Harpoon]] missiles along with containers, spare and repair parts, support and test equipment for the P-8I fleet to the Indian Navy at a value of $93 million. The possible sale of 16 aircraft-launched [[Mark 54 lightweight torpedo|Mark 54 Lightweight Torpedo]] all up rounds and 3 Mk&nbsp;54 Exercise Torpedoes for its additional P-8I fleet at a cost of $63 million was also cleared. These sales were for the second batch of four P-8Is.<ref name="BBC Ukr Harpoon">{{cite news |last=Beale |first=Jonathan |date=15 June 2022 |title=British rocket launchers to be sent to Ukraine imminently, minister says |url=https://www.bbc.com/news/live/world-europe-61792068?ns_linkname=62a9c40da48d0547a34c0449%26British%20rocket%20launchers%20to%20be%20sent%20to%20Ukraine%20imminently%2C%20minister%20says%262022-06-15T14%3A33%3A42%2B00%3A00&ns_fee=0&pinned_post_locator=urn:asset:9023d6e2-931d-4895-b201-c6f60d721124 |url-status=live |archive-url=https://web.archive.org/web/20240105234347/https://www.bbc.com/news/live/world-europe-61792068?ns_linkname=62a9c40da48d0547a34c0449%26British%20rocket%20launchers%20to%20be%20sent%20to%20Ukraine%20imminently%2C%20minister%20says%262022-06-15T14%3A33%3A42%2B00%3A00&ns_fee=0&pinned_post_locator=urn:asset:9023d6e2-931d-4895-b201-c6f60d721124 |archive-date=5 January 2024 |access-date=1 July 2022 |publisher=BBC}}</ref><ref>{{Cite web |last=Vavasseur |first=Xavier |date=2020-04-14 |title=United States Approves Possible FMS of Harpoon & Torpedoes for India's P-8I MPA |url=https://www.navalnews.com/naval-news/2020/04/united-states-approves-possible-fms-of-harpoon-torpedoes-for-indias-p-8i-mpa/ |access-date=2024-10-15 |website=Naval News |language=en-US}}</ref>

==== Second contract ====
In 2011, India planned to order twelve more P-8Is at a later date; in 2019, this was cut to eight to ten due to a limited budget.<ref name="India_induct_24">Luthra, Gulshan. [http://www.indiastrategic.in/topstories1272_Navy_to_induct_P8I.htm "Indian Navy to induct 24 Boeing P8-I maritime reconnaissance aircraft."] {{Webarchive|url=https://web.archive.org/web/20111206232151/http://www.indiastrategic.in/topstories1272_Navy_to_induct_P8I.htm |date=6 December 2011}} ''India Strategic'', December 2011.</ref><ref>{{Cite news |last=Shukla |first=Ajai |date=10 May 2019 |title=Flat budget means Navy has fewer Sea Guardian drones, P-8I aircraft |work=Business Standard |url=https://www.business-standard.com/article/current-affairs/flat-budget-means-navy-has-fewer-sea-guardian-drones-p-8i-aircraft-119051001542_1.html |url-status=live |archive-url=https://web.archive.org/web/20190514065417/https://www.business-standard.com/article/current-affairs/flat-budget-means-navy-has-fewer-sea-guardian-drones-p-8i-aircraft-119051001542_1.html |archive-date=14 May 2019}}</ref>

On 28 November 2019, the Defence Acquisition Council (DAC) approved the procurement of six additional P-8Is.<ref>{{Cite press release |title=Defence Acquisition Council, chaired by Raksha Mantri Shri Rajnath Singh, approves Capital Procurement for the Services amounting to over Rs 22,800 crore |date=2019-11-28 |publisher=[[Press Information Bureau]] |url=https://www.pib.gov.in/PressReleasePage.aspx?PRID=1594075 |access-date=2025-09-12}}</ref><ref name="india-2019plan2">{{Cite news |date=28 November 2019 |title=Deck cleared for 6 more P-8I sub-hunters. |url=https://www.livefistdefence.com/2019/11/delighted-with-fleet-indian-navy-clears-decks-for-6-more-p-8is.html |url-status=live |archive-url=https://web.archive.org/web/20191128151940/https://www.livefistdefence.com/2019/11/delighted-with-fleet-indian-navy-clears-decks-for-6-more-p-8is.html |archive-date=28 November 2019 |access-date=28 November 2019 |work=[[Livefist]] |location=[[New Delhi]]}}</ref> By 27 July 2020, reports revealed that Indian Ministry of Defence has sent [[Letter of Request]] (LoR) to the [[US Government]] for the procurement at an estimated cost of $1.8&nbsp;billion. The LoR was forwarded to the [[Defense Security Cooperation Agency]] (DSCA) and the proposal featured on a notice by the agency under the US [[Foreign Military Sales]] (FMS) program. The DSCA is expected to respond with a Letter of Acceptance (LoA) with the deal expected to be signed by early 2021.<ref>{{Cite web |date=2020-07-27 |title=India requests six additional P-8I maritime multi-mission aircraft from US |url=https://www.janes.com/osint-insights/defence-news/india-requests-six-additional-p-8i-maritime-multi-mission-aircraft-from-us |access-date=2024-10-15 |website=Janes |language=en}}</ref>

On 30 April 2021, the [[US Department of Defense]] (DoD) cleared the sale of six P-8Is and related equipment to India at an estimated cost of $2.42&nbsp;billion. The numbers were reduced from ten due to budget constraints. The related equipment includes eight Multifunctional Information Distribution System-Joint Tactical Radio Systems 5 (MIDS-JTRS 5) (6 installed, 2 spares); forty-two AN/AAR-54 Missile Warning Sensors (36 installed, 6 spares); and fourteen LN-251 with Embedded Global Positioning Systems (GPS)/Inertial Navigations Systems (EGIs) (12 installed, 2 spares). The DSCA informed about the clearance to the [[US Congress]].<ref>{{Cite news |last=Peri |first=Sriram Lakshman & Dinakar |date=2021-05-01 |title=U.S. clears sale of six P-8I patrol aircraft to India |url=https://www.thehindu.com/news/national/us-clears-sale-of-six-p-8i-patrol-aircraft-to-india/article34455535.ece |url-status=live |archive-url=https://web.archive.org/web/20250912051343/https://www.thehindu.com/news/national/us-clears-sale-of-six-p-8i-patrol-aircraft-to-india/article34455535.ece/amp/ |archive-date=2025-09-12 |access-date=2025-09-12 |work=The Hindu |language=en-IN |issn=0971-751X}}</ref><ref>{{Cite news |last=Stone |first=Mike |date=2021-05-01 |title=U.S. State Department OKs potential sale of P-8 surveillance planes to India -Pentagon |url=https://www.reuters.com/world/asia-pacific/us-state-department-approves-potential-sale-p-8-surveillance-planes-india-2021-04-30/ |access-date=2025-09-12 |work=[[Reuters]]}}</ref><ref>{{Cite web |last=Vavasseur |first=Xavier |date=2021-05-03 |title=United States Approves Possible FMS of 6 P-8I Maritime Patrol Aircraft to India |url=https://www.navalnews.com/naval-news/2021/05/united-states-approves-possible-fms-of-6-p-8i-maritime-patrol-aircraft-to-india/ |access-date=2024-10-15 |website=Naval News |language=en-US}}</ref>

By 2025, the price of the possible sale of six additional P-8Is were increased by 50% in view of the supply chain costs.<ref>{{Cite news |last=Samanta |first=Pranab Dhal |date=2025-07-10 |title=India looks to US for urgent weapons after Operation Sindoor strikes |url=https://economictimes.indiatimes.com/news/defence/india-looks-to-us-for-urgent-weapons-after-operation-sindoor-strikes/articleshow/122349623.cms |access-date=2025-07-12 |work=The Economic Times |issn=0013-0389}}</ref> On 7 August 2025, ''[[Reuters]]'' quoted three Indian officials and reported that multiple planned defence procurements from the US — including the case for six additional aircraft — had been halted,<ref>{{Cite news |date=2025-08-08 |title=Exclusive: India pauses plans to buy US arms after Trump's tariffs |url=https://www.reuters.com/business/aerospace-defense/india-pauses-plans-buy-us-arms-after-trumps-tariffs-2025-08-08/ |access-date=2025-08-12 |work=[[Reuters]]}}</ref><ref>{{cite web |title=India Halts Purchase of U.S. P-8I Poseidon Jets after Price Hike |url=https://www.defensemirror.com/news/40006/India_Halts_Purchase_of_U_S__P_8I_Poseidon_Jets_after_Price_Hike__Tariff_Impact |website=Defense Mirror |access-date=8 August 2025 |date=7 August 2025}}</ref> though the claims were rejected by the Indian Defence Ministry as "false and fabricated" the following day.<ref>{{Cite news |date=2025-08-08 |title=Ministry of Defence denies reports of pausing defence purchases with U.S. |url=https://www.thehindu.com/news/national/ministry-of-defence-denies-reports-of-pausing-defence-purchases-with-us/article69909748.ece |access-date=2025-08-12 |work=The Hindu |language=en-IN |issn=0971-751X}}</ref><ref>{{Cite news |date=2025-08-08 |title='No pause in talks related to buying US arms': Centre clarifies, pans 'false & fabricated' report |url=https://timesofindia.indiatimes.com/business/india-business/no-pause-in-talks-related-to-buying-us-arms-centre-clarifies-pans-false-fabricated-report/articleshow/123187356.cms |access-date=2025-08-12 |work=The Times of India |issn=0971-8257}}</ref><ref>{{Cite web |last=Sharma |first=Shivani |date=2025-08-11 |title=India-US defence talks on; Tejas engine deliveries, follow-on orders fast-tracked |url=https://www.indiatoday.in/india/story/india-us-defence-talks-on-tejas-engine-deliveries-follow-on-orders-fast-tracked-2769505-2025-08-11 |access-date=2025-08-12 |website=India Today |language=en}}</ref> The US Department of Defense and Boeing officials visited India between 16 and 19 September<ref>{{Cite web |date=2025-09-16 |title=Six more P 8Is coming: India and US set to seal $4 billion deal for Navy - BusinessToday |url=https://www.businesstoday.in/india/story/six-more-p-8is-coming-india-and-us-set-to-seal-4-billion-deal-for-navy-494176-2025-09-16 |access-date=2025-09-16 |website=Business Today |language=en}}</ref> for detailed discussions on their current offers on the additional procurement of P-8I aircraft made to the Indian government. The US delegation included officials from the undersecretary of defence for policy, Navy International Programs Office (NIPO), Maritime Patrol and Reconnaissance Aircraft Program Office (PMA 290), and the DSCA. While the NIPO strengthens global maritime partnerships by facilitating the export and transfer of capabilities that advance U.S. strategic security interests, the PMA-290 is responsible for the acquisition, sustainment, and delivery of maritime patrol aircraft. The deal cost could range around $4&nbsp;billion.<ref>{{Cite news |date=2025-09-10 |title=US sending team to India for talks to sell more P-8 surveillance aircraft |url=https://www.hindustantimes.com/india-news/us-sending-team-to-india-for-talks-to-sell-more-p-8-surveillance-aircraft-101757523922350.html |access-date=2025-09-11 |work=[[Hindustan Times]]}}</ref><ref>{{Cite web |date=2025-09-10 |title='Cooperation Continues': US Defence, Boeing Officials To Visit India Next Week For Talks On P-8I Aircraft |url=https://www.news18.com/india/cooperation-continues-us-defence-boeing-officials-to-visit-india-next-week-for-talks-on-p-8i-aircraft-ws-l-9563440.html |access-date=2025-09-11 |website=News18 |language=en}}</ref><ref>{{Cite news |date=2025-09-11 |title=$4 billion P-8I naval aircraft defence deal: US team may come to India to negotiate sale; talks amid fresh trade deal push |url=https://timesofindia.indiatimes.com/business/india-business/4-billion-p-8i-naval-aircraft-deal-us-team-may-come-to-india-to-negotiate-sale-talks-amid-fresh-trade-deal-push/articleshow/123827185.cms |access-date=2025-09-11 |work=The Times of India |issn=0971-8257}}</ref>

==== Operations ====
In 2014, several Indian Navy P-8Is conducted search operations for the missing [[Malaysia Airlines Flight 370]].<ref name="sp31m14" /> The Indian Navy inducted the first squadron in November 2015.<ref>{{Cite web |last=Diplomat |first=Franz-Stefan Gady |title=India Inducts First Squadron of Anti-Submarine Warfare Plane |url=https://thediplomat.com/2015/11/india-inducts-first-squadron-of-anti-submarine-warfare-plane/ |url-status=live |archive-url=https://web.archive.org/web/20161109163242/https://thediplomat.com/2015/11/india-inducts-first-squadron-of-anti-submarine-warfare-plane/ |archive-date=9 November 2016 |access-date=5 June 2016 |website=The Diplomat}}</ref> The aircraft, based in INS Rajali, was deployed during the search operations of the wreckage after the [[2016 Indian Air Force An-32 crash]] in the [[Bay of Bengal]].<ref name=":8" /> P-8Is were deployed in the [[Doklam#2017 Doklam standoff|2017 Doklam Standoff]] between the [[Indian Army]] and China's [[People's Liberation Army]]. Indian Navy P-8Is also monitored [[Pakistan Army|Pakistani Army]] units during the [[2019 India–Pakistan border skirmishes|2019 Pulwama standoff]].<ref>{{Cite web |date=17 February 2020 |title=Came to know of Navy's P-8I aircraft's capabilities during Doklam episode: CDS General Bipin Rawat |url=https://timesofindia.indiatimes.com/india/came-to-know-of-navys-p-8i-aircrafts-capabilities-during-doklam-episode-cds-general-bipin-rawat/articleshow/74178644.cms |url-status=live |archive-url=https://web.archive.org/web/20200217171438/https://timesofindia.indiatimes.com/india/came-to-know-of-navys-p-8i-aircrafts-capabilities-during-doklam-episode-cds-general-bipin-rawat/articleshow/74178644.cms |archive-date=17 February 2020 |access-date=17 February 2020 |website=Times of India}}</ref> On 4 June 2019, one of the P-8I aircraft was deployed in during the search and rescue operations following [[2019 Indian Air Force An-32 crash]].<ref>{{Cite press release |title=Indian Air Force AN-32 Aircraft Crash |date=2019-06-13 |publisher=[[Press Information Bureau]] |url=https://www.pib.gov.in/newsite/PrintRelease.aspx?relid=190454 |access-date=2025-09-12}}</ref>

In August 2024, it was announced that the Indian Navy's P-8I fleet will be maintained by Air India Engineering Services Limited (AIESL), a subsidiary of [[Air India]], which signed a deal with [[Boeing]] for receiving training for its personnel. AIESL had already overhauled the landing gear of the entire fleet.<ref>{{Cite web |title=Boeing Collaborates with AIESL for Maintenance Training in India |url=https://www.boeing.co.in/news/2024/boeing-partners-with-aiesl-for-component-mro-to-support-indian-p-8i-fleet |access-date=2024-08-14 |website=www.boeing.co.in |language=en-IN}}</ref><ref>{{Cite news |date=2024-08-13 |title=Boeing partners with AIESL to provide services to Indian Navy's P-8I aircraft |url=https://economictimes.indiatimes.com/news/defence/boeing-partners-with-aiesl-to-provide-services-to-indian-navys-p-8i-aircraft/articleshow/112496004.cms?from=mdr |access-date=2024-08-14 |work=The Economic Times |issn=0013-0389}}</ref><ref>{{Cite web |last=Desk |first=NDTV Profit |date=2024-08-13 |title=Boeing, AIESL Collaborate To Provide Services To Indian Navy's P-8I Aircraft |url=https://www.ndtvprofit.com/business/boeing-aiesl-collaborate-to-provide-services-to-indian-navys-p-8i-aircraft |access-date=2024-08-14 |website=NDTV Profit |language=en}}</ref>

During Exercise Konkan 2025 conducted between [[UK Carrier Strike Group#Carrier Strike Group 25 (Operation Highmast)|UK Carrier Strike Group 2025]] and {{INS|Vikrant|2013|6}}-led [[Carrier battle group#India|Carrier Battle Group]], included an [[anti-submarine warfare]] operation. Royal Navy [[Merlin Mk2]] helicopters operating from {{HMS|Prince of Wales|R09}} and {{HMS|Richmond|F239}} and Indian Navy P-8I Neptune aircraft were deployed during the operation, while an Indian submarine was the target.<ref>{{Cite press release |title=Royal Navy begins high-profile India visit after two nations’ carrier groups link up for historic first |date=2025-10-08 |publisher=[[Royal Navy]] |url=https://www.royalnavy.mod.uk/news/2025/october/08/20251008-royal-navy-begins-high-profile-india-visit |access-date=2025-10-10}}</ref><ref>{{Cite web |last=Zubova |first=Xenia |date=2025-10-09 |title=HMS Richmond arrives in Mumbai as UK signs major defence deals with India |url=https://www.forcesnews.com/csg25/royal-navy-frigate-hms-richmond-arrives-mumbai-uk-signs-major-defence-deals-india |access-date=2025-10-10 |website=www.forcesnews.com |language=en}}</ref>

===Australia===
[[File:Royal Australian Air Force (A47-010) Boeing P-8A Poseidon conducting a touch-and-go at Canberra Airport (3).jpg|thumb|An Australian P-8A in November 2020]]

On 20 July 2007, the [[Minister for Defence (Australia)|Australian Minister for Defence]] announced that the P-8A was the preferred aircraft to replace the [[Royal Australian Air Force]] fleet of Lockheed [[AP-3C Orion]]s in conjunction with a then yet-to-be-selected unmanned aerial vehicle. The last AP-3C was scheduled to be retired in 2018, after nearly 30 years of service.<ref>[http://www.minister.defence.gov.au/NelsonMintpl.cfm?CurrentId=6875 "First pass approval for Orion replacement."] {{Webarchive|url=https://web.archive.org/web/20070901015329/http://www.minister.defence.gov.au//NelsonMintpl.cfm?CurrentId=6875 |date=1 September 2007}} ''The Hon. Dr Brendan Nelson, Minister for Defence,'' 20 July 2007.</ref><ref>[http://www.janes.com/articles/Janes-Defence-Weekly-2009/Avalon-2009-Australia-looks-set-to-join-P-8-programme.html "Asia Pacific: Avalon 2009: Australia looks set to join P-8 programme."] ''Jane's.'' Retrieved: 29 August 2012.</ref> In March 2009, Australia's Chief of Air Force stated that the RAAF planned to introduce the P-8A in 2016.<ref>{{Cite web |title=Air Power: P-8A Poseidon project overview {{!}} ADM Feb 2011 - Australian Defence Magazine |url=https://www.australiandefence.com.au/news/air-power-p-8a-poseidon-project-overview-adm-feb-2011 |access-date=2024-06-16 |website=www.australiandefence.com.au |language=en}}</ref>

In October 2012, Australia formalized its participation, committing [[Australian dollar|A$]]73.9m (US$81.1m) in an agreement with the USN.<ref>{{Cite magazine |last=Waldron |first=Greg |date=5 October 2012 |title=Australia signs A$73.9m deal to participate in P-8A development |url=http://www.flightglobal.com/news/articles/australia-signs-a739m-deal-to-participate-in-p-8a-development-377324/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20121008044407/http://www.flightglobal.com/news/articles/australia-signs-a739m-deal-to-participate-in-p-8a-development-377324/ |archive-date=8 October 2012 |via=[[FlightGlobal]] |url-access=subscription}}</ref> In July 2013, [[Geoff Brown (RAAF officer)|Air Marshal Geoff Brown]], head of the RAAF, said Australia was considering buying more P-8As and fewer [[Northrop Grumman MQ-4C Triton|MQ-4C Triton]] UAVs than earlier planned.<ref>[http://www.navyrecognition.com/index.php?option=com_content&task=view&id=1154 "Australia plans to procure more P-8 Poseidon MPA than planned, reducing MQ-4C Triton UAS order"] {{Webarchive|url=https://web.archive.org/web/20130720213348/http://www.navyrecognition.com/index.php?option=com_content&task=view&id=1154 |date=20 July 2013}}&nbsp;– Airrecognition.com, 18 July 2013.</ref> On 21 February 2014, Prime Minister [[Tony Abbott]] announced the intention to procure eight P-8As plus options for four more; entry into service is planned for 2021.<ref name="CT20140221">{{Cite news |date=21 February 2014 |title=Abbott government to spend $4b on new patrol aircraft |work=Canberra Times |url=http://www.canberratimes.com.au/federal-politics/political-news/abbott-government-to-spend-4b-on-new-patrol-aircraft-20140221-335t4.html |url-status=dead |archive-url=https://web.archive.org/web/20140408151802/http://www.canberratimes.com.au/federal-politics/political-news/abbott-government-to-spend-4b-on-new-patrol-aircraft-20140221-335t4.html |archive-date=8 April 2014}}</ref>

In July 2014, negotiations commenced between Boeing and the US Department of Defense to integrate the [[Harpoon (missile)|AGM-84 Harpoon]] Block 1G anti-ship missile onto the P-8A on Australia's behalf.<ref>{{Cite magazine |last=McLaughlin |first=Andre |date=29 July 2014 |title=Australia pushes for Harpoon integration on P-8As |url=http://www.flightglobal.com/news/articles/australia-pushes-for-harpoon-integration-on-p-8as-402134/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20140729190504/http://www.flightglobal.com/news/articles/australia-pushes-for-harpoon-integration-on-p-8as-402134/ |archive-date=29 July 2014 |via=[[FlightGlobal]] |url-access=subscription}}</ref> In August 2014, the USN concluded an advanced acquisition contract on the first four of up to 12 P-8As to be bought by Australia, with delivery expected from 2017.<ref>{{Cite magazine |last=Stevenson |first=Beth |date=27 August 2014 |title=USN contracts for first four Australian P-8As |url=http://www.flightglobal.com/news/articles/usn-contracts-for-first-four-australian-p-8as-403059/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20140911160423/http://www.flightglobal.com/news/articles/usn-contracts-for-first-four-australian-p-8as-403059/ |archive-date=11 September 2014 |via=[[FlightGlobal]] |url-access=subscription}}</ref> In January 2016, Australia ordered a further four P-8As.<ref>{{Cite magazine |last=Drew |first=Andrew |date=29 January 2016 |title=Boeing secures deal for 20 US and Australian P-8 Poseidons |url=https://www.flightglobal.com/news/articles/boeing-secures-deal-for-20-us-and-australian-p-8-pos-421406/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20160914021415/https://www.flightglobal.com/news/articles/boeing-secures-deal-for-20-us-and-australian-p-8-pos-421406/ |archive-date=14 September 2016 |via=[[FlightGlobal]] |url-access=subscription}}</ref> The 2016 Defence White Paper stated that eight P-8As would be in service in the early 2020s and that 15 P-8As are planned for by the late 2020s.<ref name="Aust_White_Paper">{{Cite book |url=http://www.defence.gov.au/WhitePaper/Docs/2016-Defence-White-Paper.pdf |title=2016 Defence White Paper |publisher=Commonwealth of Australia |year=2016 |isbn=978-0-9941680-5-4 |location=Australia |pages=87, 94 |archive-url=https://web.archive.org/web/20160403192146/http://www.defence.gov.au/WhitePaper/Docs/2016-Defence-White-Paper.pdf |archive-date=3 April 2016 |url-status=live}}</ref> Including support facilities, the first group of eight aircraft's total cost is estimated at $3.6 billion (AU$4 billion).<ref>{{Cite magazine |date=24 July 2016 |title=Boeing to Produce 4 Anti-Submarine Warfare Planes for Australia |url=https://thediplomat.com/2016/07/boeing-to-produce-4-anti-submarine-warfare-planes-for-australia/? |url-status=live |magazine=The Diplomat |archive-url=https://web.archive.org/web/20160728112639/https://thediplomat.com/2016/07/boeing-to-produce-4-anti-submarine-warfare-planes-for-australia/ |archive-date=28 July 2016}}</ref>

The RAAF accepted its first P-8A on 27 September 2016;<ref name="RAAF First Poseidon off the rank">{{Cite news |last=Watson |first=Sean |date=6 October 2016 |title=First Poseidon off the rank |page=3 |work=Air Force |publisher=Department of Defence |url=https://airforcenews.partica.online/airforce-news/october-6th-2016/flipbook/2/ |url-status=live |access-date=13 December 2019 |archive-url=https://web.archive.org/web/20191213232048/https://airforcenews.partica.online/airforce-news/october-6th-2016/flipbook/2/ |archive-date=13 December 2019}}</ref> it arrived in Australia on 14 November.<ref>{{Cite news |date=17 November 2016 |title=First Poseidon touches down |work=Australian Defence Magazine |url=http://www.australiandefence.com.au/news/first-poseidon-touches-down |url-status=live |archive-url=https://web.archive.org/web/20161118135704/http://www.australiandefence.com.au/news/first-poseidon-touches-down |archive-date=18 November 2016}}</ref> The RAAF had received 12 P-8As by 13 December 2019.<ref name="RAAF_receives_12th">{{Cite web |last=Dominguez |first=Gabriel |date=13 December 2019 |title=RAAF receives 12th Boeing P-8A Poseidon aircraft |url=https://www.janes.com/defence-news/news-detail/raaf-receives-12th-boeing-p-8a-poseidon-aircraft |url-status=live |archive-url=https://web.archive.org/web/20220630092712/https://www.janes.com/defence-news/news-detail/raaf-receives-12th-boeing-p-8a-poseidon-aircraft |archive-date=30 June 2022 |access-date=1 January 2022 |website=Jane's 360}}</ref> The Australian Government approved ordering two additional aircraft on 30 December 2020. The option to acquire a 15th aircraft may not be taken up.<ref name="RAAF_14_ordered">{{Cite news |last=McLaughlin |first=Andrew |date=30 December 2020 |title=Australia orders two additional Boeing P-8A Poseidons |work=ADBR |url=https://adbr.com.au/australia-orders-two-additional-boeing-p-8a-poseidons/ |url-status=live |access-date=10 January 2021 |archive-url=https://web.archive.org/web/20211009120837/https://adbr.com.au/australia-orders-two-additional-boeing-p-8a-poseidons/ |archive-date=9 October 2021}}</ref>

According to the Australian Defence Minister, [[Richard Marles]], in May 2022 a Chinese [[J-16]] is alleged to have flown alongside a RAAF P-8A, deploying [[flare]]s and [[Chaff (countermeasure)|chaff]]. One piece of chaff is alleged to have been ingested into the P-8A's engine.<ref>{{Cite news |date=5 June 2022 |title=Chinese fighter jet 'chaffs' Australian plane near South China Sea, Canberra alleges |work=CNN |url=https://edition.cnn.com/2022/06/05/australia/australia-china-plane-intercept-intl-hnk-ml/index.html |url-status=live |access-date=5 June 2022 |archive-url=https://web.archive.org/web/20220605055938/https://edition.cnn.com/2022/06/05/australia/australia-china-plane-intercept-intl-hnk-ml/index.html |archive-date=5 June 2022}}</ref> On 20 October 2025 Australian Defence Minister Richard Marles disclosed that a Chinese Su-35 fighter jet had released flares "very close" to a P-8A aircraft doing routine surveillance in international airspace over the South China Sea the previous day, stating also that the plane was not damaged.<ref>{{Cite news |date=20 October 2025 |title=Federal politics: Chinese aircraft releases flares near Australian military plane — as it happened |work=ABC News|url=https://www.abc.net.au/news/2025-10-20/federal-politics-live-blog-october-20/105910558 |url-status=live |access-date=20 October 2025 |archive-url=https://web.archive.org/web/20251021012304/https://www.abc.net.au/news/2025-10-20/federal-politics-live-blog-october-20/105910558 |archive-date=21 October 2025}}</ref>

===United Kingdom===
[[File:First RAF Poseidon.jpg|thumb|The Royal Air Force's first P-8]]

In August 2012, it was reported that Boeing saw the [[United Kingdom]] as a market for the P-8, following the cancellation of the [[Nimrod MRA4]] in 2010.<ref>"UK eyes maritime surveillance aircraft." ''AirForces Monthly'', August 2012, p. 5.</ref><ref>{{Cite web |last=Osborne |first=Anthony |date=12 September 2013 |title=U.K. Maritime Patrol Capability Re-Enters The Fray |url=http://www.aviationweek.com/Article.aspx?id=/article-xml/awx_09_12_2013_p0-615385.xml |url-status=dead |archive-url=https://web.archive.org/web/20140117035826/http://www.aviationweek.com/Article.aspx?id=%2Farticle-xml%2Fawx_09_12_2013_p0-615385.xml |archive-date=17 January 2014 |website=Aviation Week}}</ref> On 23 November 2015, the UK announced its intention to order nine P-8s in the [[Strategic Defence and Security Review 2015]], that would be based at [[RAF Lossiemouth]] in Scotland, to protect the UK's [[nuclear deterrent]] and aircraft carriers and for [[Search and rescue|search-and-rescue]] and [[Aerial reconnaissance|overland reconnaissance]].<ref name="DefenceReview">{{Cite news |date=23 November 2015 |title=National Security Strategy and Strategic Defence and Security Review |agency=Ministry of Defence |url=https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/478933/52309_Cm_9161_NSS_SD_Review_web_only.pdf |url-status=live |archive-url=https://web.archive.org/web/20151124082813/https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/478933/52309_Cm_9161_NSS_SD_Review_web_only.pdf |archive-date=24 November 2015}}</ref><ref>{{Cite web |date=23 November 2015 |title=U.K. To Buy 138 F-35s, Will Boost Fighter Squadrons |url=http://aviationweek.com/defense/uk-buy-138-f-35s-will-boost-fighter-squadrons/ |url-access=subscription |url-status=live |archive-url=https://web.archive.org/web/20161104152820/http://aviationweek.com/defense/uk-buy-138-f-35s-will-boost-fighter-squadrons |archive-date=4 November 2016 |website=Aviation Week}}</ref>

On 25 March 2016, the U.S. State Department approved a proposed [[Foreign Military Sale]] to the UK for up to nine P-8s and associated support.<ref>{{Cite web |date=25 March 2016 |title=United Kingdom&nbsp;– P-8A Aircraft and Associated Support |url=http://www.dsca.mil/major-arms-sales/united-kingdom-p-8a-aircraft-and-associated-support |url-status=live |archive-url=https://web.archive.org/web/20160402053131/http://www.dsca.mil/major-arms-sales/united-kingdom-p-8a-aircraft-and-associated-support |archive-date=2 April 2016 |website=Defense Security Cooperation Agency}}</ref> During an April 2016 tour of US anti-submarine capabilities, the British defense procurement minister stated that the [[Royal Air Force]] would initially operate the P-8 with U.S. weapons, with the option to use British weapons later.<ref>{{Cite news |date=19 April 2016 |title=US, UK Still Discussing Anti-Sub Gap Options |url=https://www.defensenews.com/story/defense/naval/naval-aviation/2016/04/19/us-uk-asw-antisub-russia-p8/83224392/ |url-status=live |archive-url=https://web.archive.org/web/20230313153925/https://www.defensenews.com/naval/2016/04/19/us-uk-still-discussing-anti-sub-gap-options/ |archive-date=13 March 2023 |access-date=19 April 2016 |agency=Defense News}}</ref> It was not initially clear whether the UK would have access to future ground-surveillance capabilities developed for the P-8.<ref>{{Cite web |date=26 November 2015 |title=U.K. Strives To Become More Reliable Defense Partner |url=http://aviationweek.com/defense/uk-strives-become-more-reliable-defense-partner?NL=AW-19&Issue=AW-19_20151126_AW-19_309&sfvc4enews=42&cl=article_1&elq2=b28fa104e023431c811065e387b1570a/ |url-access=subscription |url-status=live |archive-url=https://web.archive.org/web/20180201024639/http://aviationweek.com/defense/uk-strives-become-more-reliable-defense-partner?NL=AW-19&Issue=AW-19_20151126_AW-19_309&sfvc4enews=42&cl=article_1&elq2=b28fa104e023431c811065e387b1570a%2F |archive-date=1 February 2018 |website=Aviation Week}}</ref><ref>{{Cite web |last=Allison |first=George |date=2016-09-30 |title=UK to examine improving P-8 ground surveillance capabilities |url=https://ukdefencejournal.org.uk/uk-examine-improving-p-8-ground-surveillance-capabilities/ |url-status=live |archive-url=https://web.archive.org/web/20200918135548/https://ukdefencejournal.org.uk/uk-examine-improving-p-8-ground-surveillance-capabilities/ |archive-date=18 September 2020 |access-date=2024-09-21 |language=en-GB}}</ref>{{Update inline|date=September 2024}} On 11 July 2016, Boeing announced the signing of a $3.87 billion (£3 billion) contract for nine P-8s and support infrastructure, in three production lots over ten years, with deliveries commencing in 2019.<ref>{{Cite web |date=12 July 2016 |title=Boeing agrees surveillance aircraft deal with UK |url=https://www.ft.com/content/c1569cf0-475d-11e6-8d68-72e9211e86ab |url-status=live |archive-url=https://web.archive.org/web/20230313153922/https://www.ft.com/content/c1569cf0-475d-11e6-8d68-72e9211e86ab#axzz4EAkRnsdw |archive-date=13 March 2023 |access-date=12 July 2016 |website=Financial Times}}</ref><ref name="2016 RAFbuy">{{Cite web |last=Hotten |first=Russell |date=11 July 2016 |title=Boeing signs £3bn deal for nine marine patrol planes |url=https://www.bbc.co.uk/news/business-36763212 |url-status=live |archive-url=https://web.archive.org/web/20180715184808/https://www.bbc.co.uk/news/business-36763212 |archive-date=15 July 2018 |website=BBC News}}</ref>

The RAF gave the aircraft the [[British military aircraft designation systems|service name]] Poseidon MRA Mk1.<ref name="Royal Air Force 2018">{{Cite web |date=20 August 2018 |title=Post relating to the Poseidon MRA Mk.1. |url=https://www.facebook.com/royalairforce/photos/a.263638134884/10156713810564885/ |url-status=live |archive-url=https://web.archive.org/web/20190422200321/https://www.facebook.com/royalairforce/photos/a.263638134884/10156713810564885/ |archive-date=22 April 2019 |website=Facebook |publisher=[[Royal Air Force]]}}</ref> They are operated by [[No. 120 Squadron RAF|120 Squadron]] and [[No. 201 Squadron RAF|201 Squadron]].<ref name="p8-announcement">{{Cite news |date=13 July 2017 |title=Defence Secretary announces new Maritime Patrol Aircraft squadrons |work=Ministry of Defence |url=https://www.gov.uk/government/news/defence-secretary-announces-new-maritime-patrol-aircraft-squadrons |url-status=live |archive-url=https://web.archive.org/web/20170713151059/https://www.gov.uk/government/news/defence-secretary-announces-new-maritime-patrol-aircraft-squadrons |archive-date=13 July 2017}}</ref><ref>{{Cite news |last=Allison |first=George |date=30 October 2019 |title=First P-8A Poseidon handed over to Royal Air Force |work=UK Defence Journal |url=https://ukdefencejournal.org.uk/first-new-p-8-poseidon-maritime-patrol-aircraft-handed-over-to-royal-air-force/ |url-status=live |access-date=28 October 2020 |archive-url=https://web.archive.org/web/20201022205453/https://ukdefencejournal.org.uk/first-new-p-8-poseidon-maritime-patrol-aircraft-handed-over-to-royal-air-force/ |archive-date=22 October 2020}}</ref> The first Poseidon MRA Mk1 (''ZP801'') made its initial flight on 13 July 2019.<ref>{{Cite web |date=13 July 2019 |title=Poseidon, The UK's New Maritime Patrol Aircraft, Takes To The Skies |url=https://www.raf.mod.uk/news/articles/poseidon-the-uks-new-maritime-patrol-aircraft-takes-to-the-skies/ |url-status=live |archive-url=https://web.archive.org/web/20190713192507/https://www.raf.mod.uk/news/articles/poseidon-the-uks-new-maritime-patrol-aircraft-takes-to-the-skies/ |archive-date=13 July 2019 |publisher=Royal Air Force}}</ref> The UK took delivery of the first aircraft, named ''Pride of Moray'', at Boeing's Seattle facility on 29 October. It arrived at [[Kinloss Barracks]] in February 2020 before moving to RAF Lossiemouth in October 2020, along with ''ZP802'' which was delivered on 13 March 2020.<ref>{{Cite news |date=4 February 2020 |title=First of RAF's new UK submarine hunters lands in Scotland |work=BBC News |url=https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-51356381 |url-status=live |access-date=14 June 2020 |archive-url=https://web.archive.org/web/20200812162624/https://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-51356381 |archive-date=12 August 2020}}</ref><ref>{{Cite web |last=Chorley |first=Dan |date=13 October 2020 |title=RAF Poseidon MRA1 arrives at RAF Lossiemouth for the first time |url=https://www.raf.mod.uk/our-organisation/stations/raf-lossiemouth/news/raf-poseidon-mra1-arrives-at-raf-lossiemouth-for-the-first-time |url-status=live |archive-url=https://web.archive.org/web/20210207101510/https://www.raf.mod.uk/our-organisation/stations/raf-lossiemouth/news/raf-poseidon-mra1-arrives-at-raf-lossiemouth-for-the-first-time |archive-date=7 February 2021 |access-date=3 February 2021 |publisher=Royal Air Force}}</ref><ref>{{Cite web |last=Jennings |first=Gareth |date=13 March 2020 |title=Second RAF Poseidon arrives in UK |url=https://www.janes.com/defence-news/news-detail/second-raf-poseidon-arrives-in-uk |url-status=live |archive-url=https://web.archive.org/web/20210211053534/https://www.janes.com/defence-news/news-detail/second-raf-poseidon-arrives-in-uk |archive-date=11 February 2021 |access-date=3 February 2021 |website=Janes.com}}</ref> The RAF declared the P-8 had reached [[initial operating capability]] (IOC) on 1 April 2020.<ref name="RAFIOC">{{Cite web |date=3 April 2020 |title=RAF Declare Poseidon an Initial Operating Capability |url=https://www.raf.mod.uk/news/articles/raf-declare-poseidon-an-initial-operating-capability/ |url-status=live |archive-url=https://web.archive.org/web/20201102024915/https://www.raf.mod.uk/news/articles/raf-declare-poseidon-an-initial-operating-capability/ |archive-date=2 November 2020 |access-date=24 May 2020 |website=raf.mod.uk}}</ref> The final ordered aircraft arrived at RAF Lossiemouth in January 2022.<ref>{{Cite web |date=11 January 2022 |title=Final P-8 Poseidon Maritime Patrol Aircraft arrives in Scotland |url=https://ukdefencejournal.org.uk/final-p-8-poseidon-maritime-patrol-aircraft-arrives-in-scotland/ |url-status=live |archive-url=https://web.archive.org/web/20220111222229/https://ukdefencejournal.org.uk/final-p-8-poseidon-maritime-patrol-aircraft-arrives-in-scotland/ |archive-date=11 January 2022 |access-date=11 January 2022}}</ref>

===Norway===
In March 2014, Norwegian newspaper ''[[Dagbladet]]'' reported that the Royal Norwegian Air Force is considering leasing aircraft from Boeing as [[No. 333 Squadron RNoAF]]'s six [[Lockheed P-3 Orion|P-3 Orions]] were becoming increasingly difficult to keep operational.<ref>{{Cite web |date=14 March 2014 |title=Norge vurderer å lease overvåkningsfly fra USA |url=http://www.dagbladet.no/2014/03/14/nyheter/innenriks/overvakning/forsvaret/nord-norge/32309079/ |url-status=live |archive-url=https://web.archive.org/web/20140319123637/http://www.dagbladet.no/2014/03/14/nyheter/innenriks/overvakning/forsvaret/nord-norge/32309079/ |archive-date=19 March 2014 |website=Dagbladet.no}}</ref> In June 2016, Norwegian newspaper ''[[Verdens Gang]]'' reported that the Norwegian government would buy four new surveillance aircraft in its long-term defense plan; the P-8 was seen as the main option.<ref>{{Cite web |date=15 June 2016 |title=Regjeringens plan: Slik blir det nye Forsvaret |url=http://www.vg.no/nyheter/innenriks/forsvaret/regjeringens-plan-slik-blir-det-nye-forsvaret/a/23712318/ |url-status=live |archive-url=https://web.archive.org/web/20160619104234/http://www.vg.no/nyheter/innenriks/forsvaret/regjeringens-plan-slik-blir-det-nye-forsvaret/a/23712318/ |archive-date=19 June 2016 |access-date=19 June 2016 |website=vg.no}}</ref> In December 2016, the [[United States Department of State|U.S. State Department]] approved the sale with congressional approval pending.<ref>{{Cite web |title=State Dept approves P-8A aircraft sale to Norway |url=http://www.upi.com/Defense-News/2016/12/22/US-State-Dept-approves-P-8A-aircraft-sale-to-Norway/8471482418463/ |url-status=live |archive-url=https://web.archive.org/web/20170327165842/http://www.upi.com/Defense-News/2016/12/22/US-State-Dept-approves-P-8A-aircraft-sale-to-Norway/8471482418463/ |archive-date=27 March 2017 |access-date=19 March 2017 |publisher=upi.com}}</ref>{{update after|2023|4|2}}<!-- did Congress approve? when? -->

On 29 March 2017, Norway signed a contract for five P-8As, to be delivered between 2022 and 2023.<ref name="Norway order17">{{Cite web |date=29 March 2017 |title=Norge har inngått kontrakt om kjøp av fem nye P-8A Poseidon maritime patruljefly |url=https://www.regjeringen.no/no/aktuelt/norge-har-inngatt-kontrakt-om-kjop-av-fem-nye-p-8a-poseidon-maritime-patruljefly/id2546045/ |url-status=live |archive-url=https://web.archive.org/web/20170330174601/https://www.regjeringen.no/no/aktuelt/norge-har-inngatt-kontrakt-om-kjop-av-fem-nye-p-8a-poseidon-maritime-patruljefly/id2546045/ |archive-date=30 March 2017 |website=Regjeringen.no}}</ref> On 13 July 2021, Boeing rolled out first P-8As Poseidon aircraft from the paint shop for Norway. The first aircraft was delivered on 18 November 2021. It is to be operated by the 133 Air Wing, 333 Squadron at [[Evenes Air Station]].<ref>{{cite web |title=Boeing Delivers First P-8A Poseidon to Norway |url=https://boeing.mediaroom.com/news-releases-statements?item=130972 |website=boeing.mediaroom.com |publisher=[[Boeing]] |access-date=15 May 2024 |language=English |date=18 November 2021 }}</ref> The first P-8 is to be named Viking and the successive four aircraft are to be named for Norse gods and a ship pilot: Vingtor, Ulabrand, Hugin and Munin.<ref>{{cite web |title=Dette skal de nye norske maritime patruljeflyene hete |url=https://www.forsvaret.no/aktuelt-og-presse/aktuelt/dette-skal-de-nye-norske-maritime-patruljeflyene-hete |website=forsvaret.no |publisher=[[Norwegian Armed Forces|Forsvaret]] |access-date=24 May 2024 |language=Norwegian |date=3 July 2021 }}</ref>

===New Zealand===
[[File:NZ4801 Warbirds Over Wanaka.jpg|thumb|A New Zealand P-8A during [[Warbirds over Wanaka#2024|Warbirds over Wanaka 2024]], with an open [[bomb bay]]]]
Boeing publicly identified the [[Royal New Zealand Air Force]] as a potential customer in 2008 as a replacement for its P-3 Orions.<ref>{{Cite magazine |date=18 June 2008 |title=Boeing identifies 14 nations for P-8A exports |url=https://www.flightglobal.com/news/articles/boeing-identifies-14-nations-for-p-8a-exports-224764/ |url-status=live |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20151222133210/https://www.flightglobal.com/news/articles/boeing-identifies-14-nations-for-p-8a-exports-224764/ |archive-date=22 December 2015 |via=[[FlightGlobal]] |url-access=subscription}}</ref> In April 2017, the U.S. State Department approved the possible foreign military sale of up to four P-8As with equipment and support, valued at US$1.46 billion (~${{Format price|{{Inflation|index=US-GDP|value=1460000000|start_year=2017}}}} in {{Inflation/year|US-GDP}}).<ref>{{Cite web |date=28 April 2017 |title=New Zealand&nbsp;– P-8A Aircraft and Associated Support |url=http://www.dsca.mil/major-arms-sales/new-zealand-p-8a-aircraft-and-associated-support |url-status=live |archive-url=https://archive.today/20170506214741/http://www.dsca.mil/major-arms-sales/new-zealand-p-8a-aircraft-and-associated-support |archive-date=6 May 2017 |website=Defense Security Cooperation Agency |location=Washington, DC}}</ref><ref>{{Cite magazine |last=Waldron |first=Greg |date=2 May 2017 |title=New Zealand requests details about P-8A Poseidon |url=https://www.flightglobal.com/news/articles/new-zealand-requests-details-about-p-8a-poseidon-436763/ |url-status=live |magazine=[[Flight International]] |location=Singapore |archive-url=https://archive.today/20170506214533/https://www.flightglobal.com/news/articles/new-zealand-requests-details-about-p-8a-poseidon-436763/ |archive-date=6 May 2017 |via=[[FlightGlobal]]}}</ref> In July 2018, the New Zealand government announced the purchase of four P-8As, to begin operations in 2023.<ref>{{Cite news |date=9 July 2018 |title=New Zealand to buy Boeing P-8 patrol planes to boost South Pacific surveillance |work=Reuters |url=https://www.reuters.com/article/us-newzealand-defence-procurement/new-zealand-to-buy-boeing-p-8-aircraft-in-1-6-billion-deal-to-boost-monitoring-of-pacific-idUSKBN1JZ07J |url-status=live |archive-url=https://web.archive.org/web/20180924145130/https://www.reuters.com/article/us-newzealand-defence-procurement/new-zealand-to-buy-boeing-p-8-aircraft-in-1-6-billion-deal-to-boost-monitoring-of-pacific-idUSKBN1JZ07J |archive-date=24 September 2018}}</ref>

Four P-8As were ordered in March 2019.<ref name="JanesOrder2019">{{Cite web |last=Jennings |first=Gareth |date=1 March 2019 |title=Poseidons for South Korea and New Zealand placed under contract |url=https://www.janes.com/article/86946/poseidons-for-south-korea-and-new-zealand-placed-under-contract |url-status=live |archive-url=https://web.archive.org/web/20190301214018/https://www.janes.com/article/86946/poseidons-for-south-korea-and-new-zealand-placed-under-contract |archive-date=1 March 2019 |website=Jane's 360 |location=London}}</ref> The RNZAF is planning to operate the type for at least 30 years.<ref>{{Cite web |title=Future Air Surveillance Capability Maritime Patrol Aircraft |url=https://www.defence.govt.nz/what-we-do/delivering-defence-capability/defence-capability-projects/future-air-surveillance-capability/ |url-status=live |archive-url=https://web.archive.org/web/20210207184359/https://www.defence.govt.nz/what-we-do/delivering-defence-capability/defence-capability-projects/future-air-surveillance-capability/ |archive-date=7 February 2021 |access-date=7 March 2021 |publisher=New Zealand Ministry of Defence}}</ref> In September 2020, the inaugural Royal New Zealand Air Force crew for the P-8A graduated training at Jacksonville, Florida.<ref>{{Cite web |title=Defence capability projects {{!}} Ministry of Defence Website |url=https://www.defence.govt.nz/what-we-do/delivering-defence-capability/defence-capability-projects/#future-air-surveillance-capability |url-status=live |archive-url=https://web.archive.org/web/20210624224334/https://www.defence.govt.nz/what-we-do/delivering-defence-capability/defence-capability-projects/#future-air-surveillance-capability |archive-date=24 June 2021 |access-date=24 June 2021 |website=www.defence.govt.nz}}</ref> This crew is to then qualify as instructors to train the first RNZAF crews back in New Zealand. The first P-8A was delivered in December 2022 with three more aircraft delivered as of July 2023.<ref name="NZDF3"/><ref>{{Cite web |title=New Zealand Completes Its Full Deck Of P-8A Aircraft |url=https://www.navalnews.com/naval-news/2023/07/new-zealand-completes-its-full-deck-of-p-8a-aircraft/ |date=2023-07-18 |first=Gordon |last=Arthur |publisher=Naval News |access-date=2023-11-29 |archive-date=30 November 2023 |archive-url=https://web.archive.org/web/20231130214319/https://www.navalnews.com/naval-news/2023/07/new-zealand-completes-its-full-deck-of-p-8a-aircraft/ |url-status=live}}</ref>

===South Korea===
In 2013, the Defense Acquisition Program Administration (DAPA) commenced a {{KRWConvert|1|t|year=2013|showdate=no}} procurement program to acquire up to 20 ASW aircraft to replace the [[Republic of Korea Navy]]'s fleet of 16 P-3Cs; possible candidates included the [[EADS CASA C-295|C-295 MPA]], P-8, Saab Swordfish and the [[Lockheed Martin C-130J Super Hercules|SC-130J Sea Hercules]].<ref>{{Cite news |last=Kang Seung-woo |date=26 May 2013 |title=Korea to but 20 anti-sub aircraft |work=The Korea Times |url=https://www.koreatimes.co.kr/www/news/nation/2013/05/116_136357.html |url-status=live |archive-url=https://web.archive.org/web/20160304062747/http://www.koreatimes.co.kr/www/news/nation/2013/05/116_136357.html |archive-date=4 March 2016}}</ref> DAPA considered procuring 12 to 20 ex-USN [[Lockheed S-3 Viking]]s.<ref>{{Cite web |title=South Korea to pave way for further S-3 Viking sales |url=http://www.janes.com/article/59161/fidae-2016-south-korea-to-pave-way-for-further-s-3-viking-sales |url-status=live |archive-url=https://web.archive.org/web/20160606090115/http://www.janes.com/article/59161/fidae-2016-south-korea-to-pave-way-for-further-s-3-viking-sales |archive-date=6 June 2016 |access-date=25 June 2016 |website=IHS Jane's 360}}</ref> In 2017, the ROKN canceled plans to buy refurbished S-3s.<ref>{{Cite web |last1=Perrett |first1=Bradley |last2=Kim |first2=Minseok |date=16 March 2017 |title=S. Korea Eyeing P-8, Swordfish As S-3 Upgrade Dropped |url=http://aviationweek.com/awindefense/s-korea-eyeing-p-8-swordfish-s-3-upgrade-dropped |url-status=live |archive-url=https://archive.today/20171019084626/http://aviationweek.com/awindefense/s-korea-eyeing-p-8-swordfish-s-3-upgrade-dropped |archive-date=19 October 2017 |website=Aviation Week |location=Melbourne, Australia and Seoul}}</ref><ref>{{Cite web |last=Waldron |first=Greg |date=18 October 2017 |title=ADEX: Big MPAs hunt for Seoul maritime requirement |url=https://www.flightglobal.com/news/articles/adex-big-mpas-hunt-for-seoul-maritime-requirement-442267/ |url-access=subscription |url-status=live |archive-url=https://archive.today/20171019084538/https://www.flightglobal.com/news/articles/adex-big-mpas-hunt-for-seoul-maritime-requirement-442267/ |archive-date=19 October 2017 |via=[[FlightGlobal]] |magazine=[[Flight International]] |location=Seoul}}</ref>

On 26 June 2018, it was announced that DAPA had selected the P-8 and would acquire six aircraft through the US Foreign Military Sales program.<ref>{{Cite news |date=26 June 2018 |title=Boeing Wins Deal for Korea's Next Maritime Patrol Plane |work=The Chosun Ilbo}}</ref> On 13 September 2018, the US state department stated it supported the sale of 6 P-8s and notified Congress.<ref>{{Cite web |date=13 September 2018 |title=Korea – P-8A Aircraft and Associated Support |url=http://dsca.mil/major-arms-sales/korea-p-8a-aircraft-and-associated-support |url-status=live |archive-url=https://web.archive.org/web/20180924185958/http://dsca.mil/major-arms-sales/korea-p-8a-aircraft-and-associated-support |archive-date=24 September 2018 |website=US DSCA}}</ref> South Korea ordered six P-8As in March 2019 with aircraft delivered in 2024.<ref name=janesSK>{{cite web| url=https://www.janes.com/osint-insights/defence-news/industry/south-korea-receives-three-p-8a-poseidons| website=Janes|title=South Korea receives three P-8A Poseidons|date=20 June 2024}}</ref>

===Germany===
The US Department of State approved a possible Foreign Military Sale of five P-8As with associated equipment to Germany for an estimated cost of $1.77 billion. The US Defense Security Cooperation Agency (DSCA) notified US Congress of the possible sale on 12 March 2021.<ref>{{Cite web |title=Germany – P-8A Aircraft and Associated Support |url=https://www.dsca.mil/press-media/major-arms-sales/germany-p-8a-aircraft-and-associated-support |url-status=live |archive-url=https://web.archive.org/web/20210510120629/https://www.dsca.mil/press-media/major-arms-sales/germany-p-8a-aircraft-and-associated-support |archive-date=10 May 2021 |access-date=14 July 2021 |website=dsca.mil}}</ref><ref>{{Cite web |date=12 March 2021 |title=Germany – P-8A Aircraft and Associated Support |url=https://www.dsca.mil/sites/default/files/mas/Germany_21-24.pdf |url-status=live |archive-url=https://web.archive.org/web/20210314054416/https://www.dsca.mil/sites/default/files/mas/Germany_21-24.pdf |archive-date=14 March 2021 |access-date=16 March 2021 |website=[[Defense Security Cooperation Agency]]}}</ref> On 23 June 2021, Germany approved the purchase of five P-8As worth $1.31 billion (~${{Format price|{{Inflation|index=US-GDP|value=1310000000|start_year=2021}}}} in {{Inflation/year|US-GDP}}).<ref>{{Cite web |date=24 June 2021 |title=Germany approves purchase of five Boeing P-8A Poseidon |url=https://www.navyrecognition.com/index.php/naval-news/naval-news-archive/2021/june/10366-germany-approves-purchase-of-five-boeing-p-8a-poseidon.html |url-status=live |archive-url=https://web.archive.org/web/20210630084900/http://navyrecognition.com/index.php/naval-news/naval-news-archive/2021/june/10366-germany-approves-purchase-of-five-boeing-p-8a-poseidon.html |archive-date=30 June 2021 |access-date=14 July 2021 |website=Navy Recognition |language=en-gb}}</ref> On 28 September 2021, Germany finalized the purchase and is to retire its existing P-3C Orions when the P-8s are delivered.<ref name="GermanyOrder2021">{{Cite web |title=Boeing Awarded Contract for Five P-8A Aircraft for Germany |url=https://boeing.mediaroom.com/news-releases-statements?item=130931 |url-status=live |archive-url=https://web.archive.org/web/20220331170720/https://boeing.mediaroom.com/news-releases-statements?item=130931 |archive-date=31 March 2022 |access-date=28 September 2021 |website=MediaRoom}}</ref> In November 2023, a simulator and an additional three P-8s were approved.<ref>{{cite web |url=https://www.bmvg.de/de/aktuelles/beschaffung-dingos-und-seefernaufklaerer-gebilligt-5703856 |title=Beschaffung neuer Dingos und Seefernaufklärer gebilligt |date=21 December 2023 |access-date=18 November 2023 |archive-date=18 November 2023 |archive-url=https://web.archive.org/web/20231118022018/https://www.bmvg.de/de/aktuelles/beschaffung-dingos-und-seefernaufklaerer-gebilligt-5703856 |url-status=live}}</ref> The first P-8A is to enter service with the German Navy in Spring 2025.<ref name="defence-network.2024-02-12">{{cite web |access-date=2024-02-12 |first1=Dorothee |last1=Frank |date=2024-02-12 |title=Wechsel von der P-3C Orion zur P-8A Poseidon |language=de |trans-title=Change from the P-3C Orion to the P-8A Poseidon |url=https://defence-network.com/wechsel-von-der-p-3c-orion-zur-p-8a-poseidon/ |website=cpm Defence Network}}</ref>

=== Canada ===
Boeing identified that the [[Royal Canadian Air Force]]'s fleet of [[CP-140 Aurora]]s (Canadian variant of the P-3 Orion) would begin to reach the end of their service life by 2025. In 2015, Boeing offered the [[Bombardier Challenger 600|Challenger MSA]], a smaller and cheaper aircraft based on the Bombardier Challenger 650 integrating many of the P-8's sensors and equipment, to complement but not replace the CP-140s. Boeing also offered the P-8A with modifications specific to Canadian operations to replace the Aurora.<ref>{{Cite web |date=29 July 2015 |title=Boeing's MSA lands in Ottawa |url=http://www.vanguardcanada.com/2015/07/29/boeings-msa-lands-in-ottawa/ |url-status=live |archive-url=https://web.archive.org/web/20160916041637/http://www.vanguardcanada.com/2015/07/29/boeings-msa-lands-in-ottawa/ |archive-date=16 September 2016 |website=vanguardcanada.com}}</ref><ref>{{Cite web |title=Boeing pitches Canada on a new multi-mission aircraft |url=http://espritdecorps.ca/boeing-pitches-canada-on-a-new-multi-mission-aircraft/ |url-status=live |archive-url=https://web.archive.org/web/20160921175144/http://espritdecorps.ca/boeing-pitches-canada-on-a-new-multi-mission-aircraft/ |archive-date=21 September 2016 |access-date=9 September 2016 |website=espritdecorps.ca}}</ref>

In 2019, Canada announced the start of a project to replace its CP-140s, valued at greater than {{CAD|5 billion|link=yes}} and named "Canadian Multimission Aircraft Project". The Canadian Armed Forces requirements call for a crewed, long-range platform, capable of providing [[Command and control|C4]], ISR, and ASW with the ability to engage/control and to fully integrate with other ISR and ASW assets.<ref>{{Cite web |date=30 May 2018 |title=Canadian Multimission Aircraft |url=http://dgpaapp.forces.gc.ca/en/defence-capabilities-blueprint/project-details.asp?id= |url-status=live |archive-url=https://web.archive.org/web/20230313153932/http://dgpaapp.forces.gc.ca/en/defence-capabilities-blueprint/index.asp |archive-date=13 March 2023 |website=Forces.gc.ca}}</ref> In 2022, Boeing officially announced it would offer the P-8A in the Canadian Multi-Mission Aircraft project<ref>{{Cite web |title=Boeing to offer the P-8A Poseidon for Canada's Multi-Mission Aircraft project |url=https://skiesmag.com/press-releases/boeing-to-offer-the-p-8a-poseidon-for-canadas-multi-mission-aircraft-project/ |url-status=live |archive-url=https://web.archive.org/web/20220210174550/https://skiesmag.com/press-releases/boeing-to-offer-the-p-8a-poseidon-for-canadas-multi-mission-aircraft-project/ |archive-date=10 February 2022 |access-date=7 June 2022}}</ref> with CAE, GE Aviation Canada, IMP Aerospace & Defence, KF Aerospace, Honeywell Aerospace Canada and Raytheon Canada.<ref>{{Cite web |title=Boeing teams with Canadian industry to offer P-8A Poseidon for CMMA Canadian Multi-Mission Aircraft requirement |url=https://www.airrecognition.com/index.php/news/defense-aviation-news/2022-news-aviation-aerospace/june/8423-boeing-teams-with-canadian-industry-to-offer-p-8a-poseidon-for-cmma-canadian-multi-mission-aircraft-requirement.html |url-status=live |archive-url=https://web.archive.org/web/20220603130336/https://www.airrecognition.com/index.php/news/defense-aviation-news/2022-news-aviation-aerospace/june/8423-boeing-teams-with-canadian-industry-to-offer-p-8a-poseidon-for-cmma-canadian-multi-mission-aircraft-requirement.html |archive-date=3 June 2022 |access-date=7 June 2022}}</ref> In March 2023, Canada announced the submission of a Letter of Request via the U.S. government's Foreign Military Sales program on the acquisition of up to 16 P-8As.<ref>{{Cite web |date=27 March 2023 |title=Boeing Statement on Canada's Multi Mission Aircraft Project |url=https://boeing.mediaroom.com/news-releases-statements?item=131233 |access-date=27 March 2023 |website=boeing.mediaroom.com |archive-date=27 March 2023 |archive-url=https://web.archive.org/web/20230327220947/https://boeing.mediaroom.com/news-releases-statements?item=131233 |url-status=live}}</ref> On 27 June 2023, the State Department approved a possible $5.9 billion sale of up to 16 P-8As and associated equipment, pending approval by Congress.<ref>{{Cite web |title=CANADA – P-8A AIRCRAFT |url=https://www.dsca.mil/press-media/major-arms-sales/canada-p-8a-aircraft |access-date=28 June 2023 |website=Defense Security Cooperation Agency |archive-date=27 June 2023 |archive-url=https://web.archive.org/web/20230627192419/https://www.dsca.mil/press-media/major-arms-sales/canada-p-8a-aircraft |url-status=live}}</ref>

On 30 November 2023, Defence Minister [[Bill Blair (politician)|Bill Blair]] announced that Canada would purchase up to 16 P-8As for {{CAD|10.4 billion}} ({{USD|7.7 billion}}).<ref name="Canada Buys upto 16 P-8As">{{cite news |last1=Shakil |first1=Ismail |last2=Lampert |first2=Allison |title=Canada to order Boeing surveillance aircraft in Bombardier rebuff |url=https://www.reuters.com/business/aerospace-defense/canada-reaches-deal-buy-boeing-surveillance-aircraft-59-billion-2023-11-30/ |access-date=February 6, 2024 |work=Reuters |publisher=Thompson Reuters Corporation |date=November 30, 2023 |archive-url=https://web.archive.org/web/20231208235026/https://www.reuters.com/business/aerospace-defense/canada-reaches-deal-buy-boeing-surveillance-aircraft-59-billion-2023-11-30/ |archive-date=December 8, 2023 |location=London |url-status = live}}</ref> The cost breakdown includes {{CAD|8 billion}} for the aircraft and related equipment while another {{CAD|2.4 billion}} is for simulators, infrastructure and weapons.<ref name="Ottawa Citizen article">{{cite news |last1=Pugliese |first1=David |title=U.S. government sole-source deal worth $8 billion for new military surveillance aircraft fleet |url=https://ottawacitizen.com/news/national/defence-watch/liberals-award-boeing-and-us-government-sole-source-deal-worth-8-billion-for-new-military-surveillance-aircraft-fleet |work=[[Ottawa Citizen]] |publisher=Postmedia News |date=30 November 2023 |archive-date=1 December 2023 |archive-url=https://web.archive.org/web/20231201060659/https://ottawacitizen.com/news/national/defence-watch/liberals-award-boeing-and-us-government-sole-source-deal-worth-8-billion-for-new-military-surveillance-aircraft-fleet |url-status=live }}</ref> Delivery of the type is expected between 2026 and 2027, with full operational capability anticipated by 2033.<ref name="Canada Buys upto 16 P-8As" /> The fleet is to be based in Nova Scotia at [[CFB Greenwood|14 Wing Greenwood]], and in British Columbia at [[CFB Comox|19 Wing Comox]].<ref name = "Canada Gov Press Release">{{cite press release |last1= Ebadi |first1 = Diana |location= Ottawa |work = [[Department of National Defence (Canada)|Department of National Defence]] |publisher = [[King's Printer|King's Printer for Canada]]| date=30 November 2023 |title=Canada purchasing up to 16 P-8A Poseidon Multi Mission Aircraft for the Royal Canadian Air Force |url=https://www.canada.ca/en/department-national-defence/news/2023/11/canada-purchasing-up-to-16-p-8a-poseidon-multi-mission-aircraft-for-the-royal-canadian-air-force.html |archive-date=4 December 2023 |archive-url=https://web.archive.org/web/20231204212356/https://www.canada.ca/en/department-national-defence/news/2023/11/canada-purchasing-up-to-16-p-8a-poseidon-multi-mission-aircraft-for-the-royal-canadian-air-force.html |url-status=live}}</ref>

===Singapore===
On 3 March 2025, Singapore's Defence Minister [[Ng Eng Hen]] announced that replacement for its Fokker 50 Maritime Patrol Aircraft is to be announced soon, with the Boeing P-8A and [[Airbus C295]] under consideration.<ref>{{cite web|url=https://www.mindef.gov.sg/news-and-events/latest-releases/speech-by-minister-for-defence--dr-ng-eng-hen--at-the-committee-of-supply-2025-on-3-march-2025 |title=Speech by Minister for Defence, Dr Ng Eng Hen, at The Committee of Supply 2025 on 3 March 2025 |access-date=5 March 2025 |df=dmy-all}}</ref> The decision to order the P-8 was confirmed in September 2025 after a meeting between Singapore's Defence Minister [[Chan Chun Sing]] and [[United States Secretary of Defense|U.S. Secretary of Defense]] [[Pete Hegseth]].<ref>{{cite news |last1=Waldron |first1=Greg |title= Singapore confirms acquisition of four Boeing P-8A maritime patrol aircraft |url=https://www.flightglobal.com/fixed-wing/singapore-confirms-acquisition-of-four-boeing-p-8a-maritime-patrol-aircraft/164458.article |work=Flight Global |date=September 10, 2025 |language=en}}</ref><ref>{{cite web |author1=Lisa Barrington |author2=Jamie Freed |title=Singapore military to buy four Boeing P-8A Poseidon patrol aircraft |url=https://www.reuters.com/business/aerospace-defense/singapore-military-buy-four-boeing-p-8a-poseidon-patrol-aircraft-2025-09-10/ |website=Reuters.com |publisher=[[Reuters]] |access-date=10 September 2025 |date=10 September 2025}}</ref><ref>{{cite web |title=P-8 Poseidon Officially Selected by Singapore as Its Next Maritime Patrol Aircraft |url=https://www.twz.com/air/p-8-poseidon-officially-selected-by-singapore-as-its-next-maritime-patrol-aircraft }}</ref>

===Potential operators===
====Brazil====
On 23 September 2022, Boeing's Latin America director, Tim Flood, presented the capabilities of the P-8 to the [[Brazilian Air Force]] commander, General [[Carlos de Almeida Baptista Júnior]]. According to Baptista Júnior, "the discussions have a great importance to prospect the future of FAB's maritime patrol aviation", as part of a plan to replace its [[Lockheed P-3 Orion|P-3AM]]s currently in service.<ref name="Brazil">{{Cite web |date=23 September 2022 |title=La Fuerza Aérea Brasileña interesada en aeronaves de patrulla P-8 Poseidon y entrenadores T-7 Red Hawk |trans-title=The Brazilian Air Force is interested in the P-8 Poseidon patrol aircraft and T-7 Red Hawk trainers |url=https://www.zona-militar.com/2022/09/23/la-fuerza-aerea-brasilena-estaria-interesada-en-aeronaves-de-patrulla-p-8-poseidon-y-entrenadores-t-7-red-hawk/ |url-status=live |archive-url=https://web.archive.org/web/20220924123725/https://www.zona-militar.com/2022/09/23/la-fuerza-aerea-brasilena-estaria-interesada-en-aeronaves-de-patrulla-p-8-poseidon-y-entrenadores-t-7-red-hawk/ |archive-date=24 September 2022 |access-date=24 September 2022 |website=Zona Militar |language=es}}</ref><ref name="Brazil2">{{Cite web |date=23 September 2022 |title=Comandante da FAB reúne-se com representantes da Boeing e da Saab |trans-title=FAB commander meet with Boeing and SAAB representatives |url=https://www.zona-militar.com/2022/09/23/la-fuerza-aerea-brasilena-estaria-interesada-en-aeronaves-de-patrulla-p-8-poseidon-y-entrenadores-t-7-red-hawk/ |url-status=live |archive-url=https://web.archive.org/web/20220924123725/https://www.zona-militar.com/2022/09/23/la-fuerza-aerea-brasilena-estaria-interesada-en-aeronaves-de-patrulla-p-8-poseidon-y-entrenadores-t-7-red-hawk/ |archive-date=24 September 2022 |access-date=24 September 2022 |website=fab.mil.br |language=pt}}</ref>

====Denmark====
According to a leaked defence list in the Danish newspaper Altinget in 2023, Denmark is considering acquiring P-8s in the near future.<ref>{{Cite web |date=19 November 2023 |title=Internt notat viser Forsvarets lange ønskeliste til politikerne |url=https://www.altinget.dk/forsvar/artikel/internt-notat-viser-forsvarets-lange-oenskeliste-til-politikerne |access-date=19 November 2023 |website=Forsvar |archive-date=19 November 2023 |archive-url=https://web.archive.org/web/20231119174115/https://www.altinget.dk/forsvar/artikel/internt-notat-viser-forsvarets-lange-oenskeliste-til-politikerne |url-status=live}}</ref> In June 2025, Denmark signed a cooperation agreement with Norway to lease Norwegian P-8 aircraft to meet immediate maritime patrol needs.<ref>{{cite web |title=Danmark kan nu leje 'det mest moderne patruljefly' til overvågning |url=https://www.dr.dk/nyheder/seneste/danmark-kan-nu-leje-det-mest-moderne-patruljefly-til-overvaagning |website=DR Nyheder |publisher=Danmarks Radio |author=Ida Meesenburg |date=5 June 2025 |access-date=5 June 2025 |language=da}}</ref>

On 15th September 2025 the Danish Minister of Defence Troels Lund Poulsen announced in a TV2 interview, that the government wishes to buy "a number" of P-8's worth at least DKK 10.000.000.000.<ref>{{cite web |title=Regeringen vil købe overvågningsfly til at patruljere Grønland |url=https://nyheder.tv2.dk/live/2025-01-06-kampen-om-groenlands-fremtid |website=TV2 Nyheder |publisher=TV2 |author=Mie Haugaard |date=15 September 2025 |access-date=15 September 2025 |language=da}}</ref>

====Italy====
Italy indicated interest in purchasing P-8s, with fleet support provided by [[Alitalia]], in 2004.<ref name="avweek_20040621">"U.S. MMA decision reverberates in Italy". ''[[Aviation Week & Space Technology]]'', 21 June 2004.</ref> However, in December 2008, Italy announced the purchase of four [[ATR 72]] aircraft to replace its aging [[Breguet Atlantic|Atlantic]] maritime patrol fleet,<ref>"Eyes Forward: Italy chooses ATR 72s for sea surveillance, but still awaits UAV type selection". ''Aviation Week and Space Technology'', 15 December 2008.</ref> possibly as a temporary solution because Italy remained interested in the P-8.<ref>Alegi, G. [http://www.dedalonews.it/it/index.php/12/2008/quattro-atr-72-da-pattugliamento-marittimo-per-laeronautica-militare Dedalonews "Quattro ATR 72 da pattugliamento marittimo" (in Italian).] {{Webarchive|url=https://web.archive.org/web/20090515161339/http://www.dedalonews.it/it/index.php/12/2008/quattro-atr-72-da-pattugliamento-marittimo-per-laeronautica-militare |date=15 May 2009}} ''l'Aeronautica Militare,'' 12 December 2008.</ref>

====NATO====
In April 2019, Boeing was reported to be in exploratory talks with various [[NATO]] allies to offer the P-8 as a NATO-shared interim solution to provide European allies with its capabilities until domestic capabilities could be secured by 2035.<ref>{{Cite web |last=Tigner |first=Brooks |date=5 April 2019 |title=NATO considers Boeing P-8 maritime patrol aircraft as temporary gap filler until 2035 |url=https://www.janes.com/article/87674/nato-considers-boeing-p-8-maritime-patrol-aircraft-as-temporary-gap-filler-until-2035 |url-status=live |archive-url=https://web.archive.org/web/20190405140123/https://www.janes.com/article/87674/nato-considers-boeing-p-8-maritime-patrol-aircraft-as-temporary-gap-filler-until-2035 |archive-date=5 April 2019 |access-date=5 April 2019 |website=Jane's 360 |location=Brussels}}</ref>

====Saudi Arabia====
In 2017, Boeing announced it had signed several agreements with [[Saudi Arabia]], which intends to order the P-8.<ref>{{Cite web |date=21 May 2017 |title=Boeing Co signs defense, commercial deals with Saudi Arabia |url=https://www.reuters.com/article/usa-trump-saudi-boeing-idUSD5N1GY00D |url-status=live |archive-url=https://web.archive.org/web/20170521180932/http://www.reuters.com/article/usa-trump-saudi-boeing-idUSD5N1GY00D |archive-date=21 May 2017 |website=reuters}}</ref> The [[International Institute for Strategic Studies]] reported in 2019 that a Saudi order for the type was still pending.<ref>{{Cite web |last=Waldwyn |first=Tom |date=4 March 2019 |title=P-8A Poseidon: leading a revived maritime patrol market |url=https://www.iiss.org/blogs/military-balance/2019/03/poseidon |url-status=live |archive-url=https://web.archive.org/web/20201107234825/https://www.iiss.org/blogs/military-balance/2019/03/poseidon |archive-date=7 November 2020 |access-date=7 March 2021 |website=Military Balance Blog |publisher=IISS}}</ref>

====Turkey====
In 2016, Turkey indicated that it planned to acquire a new MMA aircraft to supplement existing assets, the P-8A being the main candidate based on the required performance.<ref>{{Cite web |last=Burak Ege Bekdil |date=25 May 2016 |title=Turkish Navy Mulls Buying Long-Range Patrol Aircraft |url=http://www.defensenews.com/story/defense/naval/naval-aviation/2016/05/25/turkish-navy-mulls-buying-long-range-patrol-aircraft/84864896/ |url-status=live |archive-url=https://web.archive.org/web/20230313153924/https://www.defensenews.com/naval/2016/05/25/turkish-navy-mulls-buying-long-range-patrol-aircraft/ |archive-date=13 March 2023 |access-date=31 May 2016 |website=Defense News}}</ref>

===Failed bids===
====Malaysia====
In December 2017, the [[Royal Malaysian Air Force]] had shortlisted four aircraft types to replace its aging fleet of [[Beechcraft Super King Air]] used as maritime patrol aircraft; the [[Airbus C-295]], the P-8, [[ATR 72#Other versions|ATR 72 MP]], and the [[CASA/IPTN CN-235]].<ref>{{Cite web |last=Ridzwan |first=Rahmat |date=19 December 2017 |title=Malaysia discloses line of aircraft shortlisted for maritime patrol requirements |url=http://www.janes.com/article/76539 |url-status=dead |archive-url=https://archive.today/20171226164447/http://www.janes.com/article/76539/malaysia-discloses-line-of-aircraft-shortlisted-for-maritime-patrol-requirements |archive-date=26 December 2017 |website=IHS Jane's 360}}</ref> In May 2023, Malaysia selected the ATR-72MP as its replacement aircraft.<ref>{{cite web |url=https://www.defensenews.com/global/asia-pacific/2023/05/25/malaysia-inks-light-combat-jet-maritime-patrol-aircraft-deals/ |title=Malaysia inks light combat jet, maritime patrol aircraft deals | date=25 May 2023}}</ref>

==Variants==
;P-8A Poseidon
:Production variant developed for the United States Navy.
;P-8I Neptune
:Export variant for the Indian Navy<ref name=TOI090105/> with a [[CAE Inc]] AN/ASQ-508A Magnetic Anomaly Detector and a [[Griffon Corporation]] Telephonics APS-143C(V)3 multi-mode aft radar added,<ref>{{Cite web |title=P-8I Multimission Maritime Patrol Aircraft |url=https://www.naval-technology.com/projects/p-8i-maritime-patrol-aircraft-india/ |url-status=live |archive-url=https://web.archive.org/web/20200303173249/https://www.naval-technology.com/projects/p-8i-maritime-patrol-aircraft-india/ |archive-date=3 March 2020 |access-date=3 March 2020 |website=www.naval-technology.com}}</ref><ref>{{Cite web |title=Telephonics to Supply Aft Radar for India's P-8i Maritime Patrol Aircraft |url=https://www.telephonics.com/press/telephonics-corporation-to-supply-aft-radar-for-indias-p-8i-maritime-patrol-aircraft |url-status=live |archive-url=https://web.archive.org/web/20200303173246/https://www.telephonics.com/press/telephonics-corporation-to-supply-aft-radar-for-indias-p-8i-maritime-patrol-aircraft |archive-date=3 March 2020 |access-date=3 March 2020 |website=www.telephonics.com}}</ref> and a version of the Raytheon APY-10 multi-mission surface search radar that meets export requirements.<ref name="Raytheon export" /> These aircraft also incorporate [[Bharat Electronics Limited]] (BEL) Data Link II communications, which allows the P-8I to exchange tactical data between Indian Navy aircraft, ships and shore establishments;<ref>[http://www.siasat.com/english/news/boeing-use-bel-designed-datalink-ii "Boeing to use BEL designed Datalink-II."] {{Webarchive|url=https://web.archive.org/web/20110716071707/http://www.siasat.com/english/news/boeing-use-bel-designed-datalink-ii |date=16 July 2011}} ''The Siasat Diary'', 12 May 2010.</ref> it also features an integrated BEL-developed [[Identification friend or foe|IFF]] system.<ref>[http://www.thehindu.com/news/national/article971992.ece "BEL supplies P-8I aircraft equipment to Boeing."] {{Webarchive|url=https://web.archive.org/web/20101227005650/http://www.thehindu.com/news/national/article971992.ece |date=27 December 2010}} ''The Hindu'', 23 December 2010.</ref>
;Poseidon MRA1
:Royal Air Force [[British military aircraft designation systems|designation]] for the P-8A.<ref name="Royal Air Force 2018" />
;P-8 AGS
:An [[Airborne ground surveillance]] variant proposed to the USAF in 2010 as replacement to the [[E-8 Joint STARS]] fleet; equipped with a pod-mounted, [[active electronically scanned array|AESA]] radar.<ref name="pitches" />

==Operators==
<!-- Section is only for operators who have actually ordered (on contract) the P-8 per [[WP:AIRCRAFT-OPERATORS]].
-->
[[File:Map of Boeing P-8 Poseidon Operators.svg|thumb|400px|{{legend|#0000FF|Current P-8 operators}} {{legend|#00afff|Future P-8 operators}}]]

;{{AUS}}
* [[Royal Australian Air Force]]&nbsp;– 12 P-8As delivered as of July 2022,<ref name="number built">{{Cite web |title=Boeing Delivers First P-8A Poseidon to New Zealand |url=https://boeing.mediaroom.com/news-releases-statements?item=131184 |url-status=live |archive-url=https://web.archive.org/web/20221210203525/https://boeing.mediaroom.com/news-releases-statements?item=131184 |archive-date=10 December 2022 |access-date=11 December 2022 |website=MediaRoom}}</ref> with 2 more on order.<ref name=RAAF_14_ordered/><ref name="O_D_summ">{{cite web |date=31 October 2025 |title=Boeing: Orders and Deliveries (updated monthly) |url=https://www.boeing.com/commercial#orders-deliveries |access-date=14 November 2025 |publisher=Boeing}}</ref>
** [[RAAF Base Edinburgh]], [[South Australia]]
*** [[No. 11 Squadron RAAF|No. 11 Squadron]]<ref name="RAAFSqns">{{Cite web |date=21 March 2019 |title=No. 292 Squadron – Preparing the hunter |url=https://www.airforce.gov.au/news-and-events/news/no-292-squadron-preparing-hunter |url-status=live |archive-url=https://web.archive.org/web/20210302104430/https://www.airforce.gov.au/news-and-events/news/no-292-squadron-preparing-hunter |archive-date=2 March 2021 |access-date=3 February 2021 |publisher=Royal Australian Air Force}}</ref>
*** [[No. 292 Squadron RAAF|No. 292 Squadron]] ([[Operational Conversion Unit]])<ref name="RAAFSqns" />
;{{CAN}}
* [[Royal Canadian Air Force]] – 14 P-8As on order with an option for 2 more, with deliveries between 2026 and 2027. These are to be based in [[CFB Greenwood|14 Wing Greenwood]] and [[CFB Comox|19 Wing Comox]].<ref>{{cite web |url=https://www.canada.ca/en/department-national-defence/news/2023/11/canada-purchasing-up-to-16-p-8a-poseidon-multi-mission-aircraft-for-the-royal-canadian-air-force.html |title=Canada purchasing up to 16 P-8A Poseidon Multi Mission Aircraft for the Royal Canadian Air Force |date=30 November 2023 |website=Government of Canada |access-date=30 November 2023 |archive-date=4 December 2023 |archive-url=https://web.archive.org/web/20231204212356/https://www.canada.ca/en/department-national-defence/news/2023/11/canada-purchasing-up-to-16-p-8a-poseidon-multi-mission-aircraft-for-the-royal-canadian-air-force.html |url-status=live}}</ref><ref>{{Cite web |title=Canada orders 14 Poseidon P-8A maritime patrol aircraft {{!}} Shephard |url=https://www.shephardmedia.com/news/air-warfare/canada-signs-for-poseidon-p-8a-maritime-patrol-aircraft/ |access-date=2024-06-16 |website=www.shephardmedia.com |language=en}}</ref>
;{{DEU}}
* [[German Navy]]&nbsp;– 8 P-8As on order,<ref name="O_D_summ" /> with deliveries beginning in 2025. 1 delivered in November 2025. 5 initially ordered in 2021 with 3 more ordered in October 2023.<ref>{{Cite web |last=Luck |first=Alex |date=2023-11-18 |title=Germany buying more Poseidon, question marks on MAWS. |url=https://www.navalnews.com/naval-news/2023/11/germany-buying-more-poseidon-puts-question-marks-on-maws/ |access-date=2024-01-06 |website=Naval News |language=en-US |archive-date=23 December 2023 |archive-url=https://web.archive.org/web/20231223133131/https://www.navalnews.com/naval-news/2023/11/germany-buying-more-poseidon-puts-question-marks-on-maws/ |url-status=live}}</ref> These are to be assigned to [[German Navy#Formations|Naval Air Wing 3 (MFG 3) "Graf Zeppelin"]] at [[Nordholz Naval Airbase]].<ref name="defence-network.2024-02-12"/>
;{{IND}}
[[File:A P8 - I of the Indian Navy (IN 323).jpg|thumb|An Indian Navy P-8I at the Republic Day Parade Flypast 2024]]
* [[Indian Navy]]&nbsp;– 12 P-8Is operational<ref>{{Cite web |date=24 February 2022 |title=2nd Biggest Operator Of Submarine Hunters, Indian Navy Receives Its 12th P-8I Poseidon Aircraft From Boeing |url=https://eurasiantimes.com/2nd-biggest-operator-of-submarine-hunters-indian-navy-receives-its-12th-p-8i-poseidon-aircraft-from-boeing/ |url-status=live |archive-url=https://web.archive.org/web/20220321121926/https://eurasiantimes.com/2nd-biggest-operator-of-submarine-hunters-indian-navy-receives-its-12th-p-8i-poseidon-aircraft-from-boeing/ |archive-date=21 March 2022 |access-date=24 February 2022 |website=eurasiantimes.com}}</ref> 6 more planned.<ref>{{Cite web |last=Sharma |first=Shivani |date=2025-09-13 |title=India, US set to seal $4 billion deal for six more P-8I patrol aircraft |url=https://www.indiatoday.in/india/story/india-us-4-billion-deal-six-p8i-maritime-patrol-aircraft-indian-ocean-chinese-acitivities-2786739-2025-09-13 |access-date=2025-09-13 |website=India Today |language=en}}</ref>
** [[INS Rajali]], Tamil Nadu
*** [[INAS 312]]-A<ref>{{Cite web |title=INAS 312 – The Albatross |url=https://www.indiannavy.nic.in/content/p-8i |url-status=live |archive-url=https://web.archive.org/web/20220104182430/https://www.indiannavy.nic.in/content/p-8i |archive-date=4 January 2022 |access-date=3 February 2021 |publisher=Indian Navy}}</ref>
** [[INS Hansa]], Goa
*** [[INAS 316]]<ref name="navalnews202201">[https://www.navalnews.com/naval-news/2022/01/indian-navys-p-8i-neptune-mpa-commence-operations-from-ins-hansa/ Indian Navy's P-8I Neptune MPA Commence Operations from INS Hansa] {{Webarchive|url=https://web.archive.org/web/20220106064853/https://www.navalnews.com/naval-news/2022/01/indian-navys-p-8i-neptune-mpa-commence-operations-from-ins-hansa/|date=6 January 2022}} Naval News 4 January 2022</ref>
;{{NZL}}
* [[Royal New Zealand Air Force]]&nbsp;– 4 P-8As operational<ref name="NZDF3">{{cite web|title=Poseidon fleet complete|date=2023-07-20|access-date=2023-11-29|publisher=New Zealand Defence Force|url=https://www.nzdf.mil.nz/media-centre/news/poseidon-fleet-complete/|archive-date=16 August 2023|archive-url=https://web.archive.org/web/20230816011435/https://www.nzdf.mil.nz/media-centre/news/poseidon-fleet-complete/|url-status=live}}</ref>
** [[RNZAF Base Ohakea]]
*** [[No. 5 Squadron RNZAF|No. 5 Squadron]]
;{{NOR}}
* [[Royal Norwegian Air Force]]&nbsp;– 5 P-8As operational<ref>{{Cite web |last=Herk |first=Hans van |date=27 May 2022 |title=Delivery of final RNoAF Poseidon |url=https://www.scramble.nl/military-news/delivery-of-final-rnoaf-poseidon |url-status=live |archive-url=https://web.archive.org/web/20220531152704/https://www.scramble.nl/military-news/delivery-of-final-rnoaf-poseidon/ |archive-date=31 May 2022 |access-date=27 May 2022 |website=www.scramble.nl |language=en-GB}}</ref><ref name="Norway order17" />
** [[Evenes Air Station]]
*** [[No. 333 Squadron RNoAF|333 Squadron]]<ref>{{Cite web |date=30 May 2022 |title=Norwegian Air Force takes delivery of third P-8A Poseidon aircraft |url=https://www.airforce-technology.com/news/norwegian-air-force-delivery-third-p8a/ |access-date=1 April 2023 |website=Airforce Technology |archive-date=31 March 2023 |archive-url=https://web.archive.org/web/20230331212713/https://www.airforce-technology.com/news/norwegian-air-force-delivery-third-p8a/ |url-status=live}}</ref>
;{{flag|Singapore}}
* [[Republic of Singapore Air Force]]&nbsp;– 4 P-8As on order
;{{KOR}}
* [[Republic of Korea Navy]]&nbsp;– 6 P-8As operational<ref name=":9">{{Cite web |last=Polderman |first=Robin |date=2025-02-07 |title=The 61st Naval Aviation Group; Korean Sub Busters |url=https://www.theunitreport.com/post/the-61st-naval-aviation-group-korean-sub-busters |access-date=2025-11-15 |website=The Unit Report |language=en}}</ref>
** [[Pohang Gyeongju Airport|Pohang Naval Air Station]]
*** 617 Squadron<ref name=":9" />
;{{flag|United Kingdom}}
* [[Royal Air Force]]&nbsp;– 9 Poseidon MRA1s operational<ref name="Janes_8st_MRA1_delivery">{{Cite web |date=16 November 2021 |title=UK receives eighth Poseidon MRA1 |url=https://ukdefencejournal.org.uk/newest-royal-air-force-p-8-poseidon-arrives-in-scotland/ |url-status=live |archive-url=https://web.archive.org/web/20211116131502/https://ukdefencejournal.org.uk/newest-royal-air-force-p-8-poseidon-arrives-in-scotland/ |archive-date=16 November 2021 |access-date=16 November 2021 |website=Jane's 360}}</ref>
** [[RAF Lossiemouth]], Moray, Scotland
*** [[No. 42 Squadron RAF|No. 42 (Torpedo Bomber) Squadron]] (OCU)<ref name="42Sqn">{{Cite web |date=1 November 2023 |title=Number 42 Squadron reforms at RAF Lossiemouth |url=https://raf.mod.uk/news/articles/number-42-squadron-reforms-at-raf-lossiemouth/ |access-date=3 November 2023 |publisher=Royal Air Force |archive-date=2 November 2023 |archive-url=https://web.archive.org/web/20231102051949/https://raf.mod.uk/news/articles/number-42-squadron-reforms-at-raf-lossiemouth/ |url-status=live}}</ref>
*** [[No. 54 Squadron RAF|No. 54 Squadron]] (OCU) (2020–2023)<ref name="RAFSqns">{{Cite web |last=Jennings |first=Gareth |date=2 February 2021 |title=Fifth RAF Poseidon arrives in UK |url=https://www.janes.com/defence-news/news-detail/fifth-raf-poseidon-arrives-in-uk |url-status=live |archive-url=https://web.archive.org/web/20211009105733/https://www.janes.com/defence-news/news-detail/fifth-raf-poseidon-arrives-in-uk |archive-date=9 October 2021 |access-date=3 February 2021 |website=Janes.com}}</ref><ref name="42Sqn" />
*** [[No. 120 Squadron RAF|No. 120 Squadron]]<ref name="RAFSqns" />
*** [[No. 201 Squadron RAF|No. 201 Squadron]]<ref>{{Cite web |date=8 May 2021 |title=Sixth RAF Poseidon Aircraft Named 'Guernsey's Reply' |url=https://www.forces.net/news/raf/sixth-raf-poseidon-aircraft-carry-name-guernseys-reply |url-status=live |archive-url=https://web.archive.org/web/20210508183904/https://www.forces.net/news/raf/sixth-raf-poseidon-aircraft-carry-name-guernseys-reply |archive-date=8 May 2021 |access-date=10 May 2021 |website=Forces Network}}</ref>

;{{USA}}
* [[United States Navy]]&nbsp;– 136 delivered, with 3 aircraft on order as of October 2025.<ref name="O_D_summ" />
** [[Dallas Love Field]], Texas
*** [[BUPERS]] SDC Dallas<ref>{{Cite web |date=16 August 2019 |title=Scramble exclusive: BUPERS Orions and Poseidons |url=https://www.facebook.com/Scramblemagazine/posts/scramble-exclusive-bupers-orions-and-poseidonsfive-minutes-readthe-p-3-orion-res/2978737815486066/ |url-access=limited |archive-url=https://ghostarchive.org/iarchive/facebook/145237522169457/2978737815486066 |archive-date=26 February 2022 |access-date=3 February 2021 |website=Scramble Magazine (Facebook)}}{{cbignore}} {{self-published inline|date=April 2023}}</ref>
** [[Naval Air Station Jacksonville]], Florida<ref name="USNSqns">{{Cite web |title=Orbat: USN – CONUS |url=https://www.scramble.nl/planning/orbats/united-states-of-america/usn-conus |url-status=live |archive-url=https://web.archive.org/web/20210228085407/https://scramble.nl/planning/orbats/united-states-of-america/usn-conus |archive-date=28 February 2021 |access-date=3 February 2021 |website=Scramble}}</ref>
*** [[VP-5]]
*** [[VP-8]]
*** [[VP-10]]
*** [[VP-16]]
*** [[VP-26]]
*** [[VP-30]] ([[Fleet Replacement Squadron]])
*** [[VP-45]]
*** [[VP-62 (1970–present)|VP-62]] (Naval Air Reserve)<ref>{{Cite web |title=Navy Reserve Poseidon |url=https://www.scramble.nl/military-news/navy-reserve-poseidon |access-date=28 September 2023 |website=scramble.nl |date=7 August 2023 |archive-date=12 October 2023 |archive-url=https://web.archive.org/web/20231012194631/https://www.scramble.nl/military-news/navy-reserve-poseidon |url-status=live}}</ref>
** [[Naval Air Station Patuxent River]], Maryland<ref name="USNSqns" />
*** [[VX-1]]
*** [[VX-20]]
** [[Naval Air Station Whidbey Island]], Washington<ref name="USNSqns" />
*** [[VP-1]]
*** [[VP-4]]
*** [[VP-9]]
*** [[VP-40 (1951–present)|VP-40]]
*** [[VP-46]]
*** [[VP-47]]
*** [[VP-69]] (Naval Air Reserve)<ref>{{Cite web |title=Patrol Squadron (VP) 69 "Totems" |url=https://www.airpac.navy.mil/Organization/Patrol-Squadron-VP-69/ |access-date=28 September 2023 |website=airpac.navy.mil |archive-date=12 October 2023 |archive-url=https://web.archive.org/web/20231012194630/https://www.airpac.navy.mil/Organization/Patrol-Squadron-VP-69/ |url-status=live}}</ref>
<!-- ***[[VP-69]] - P-8A aircraft on order with deliveries to begin in 2023.<ref>https://seapowermagazine.org/navy-proposes-conversion-of-2-active-p-8-squadrons-to-reserve/ {{Bare URL inline|date=August 2022}}</ref> -->
<!-- Section is only for operators who have actually ordered (on contract) the P-8 per [[WP:AIRCRAFT-OPERATORS]]. -->

==Specifications (P-8A)==
[[File:P-8A Poseidon of VP-16 dropping torpedo in 2013.JPG|thumb|right|A P-8A of VP-16 dropping a [[Mark 46 torpedo]]]]
[[File:Operators on Indian Navy's Boeing P-8I search for Malaysia Airlines Flight 370 (2).JPG|thumb|Crew on board an Indian Navy P-8I searching for missing airliner [[MH370]] ]]

{{Aircraft specs
|prime units?= imp
|ref= ''United States Navy'',<ref name="USN_Fact_File_P-8">[http://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 "P-8A Multi-mission maritime aircraft."] {{Webarchive|url=https://web.archive.org/web/20070711021443/https://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 |date=11 July 2007}} ''[[United States Navy]]'', 25 January 2007. Retrieved: 15 March 2011.</ref><ref>{{Cite web |date=5 July 2013 |title=P-8A Poseidon fires Harpoon, hits mark |url=http://www.navair.navy.mil/index.cfm?fuseaction=home.NAVAIRNewsStory&id=5411 |url-status=dead |archive-url=https://web.archive.org/web/20151018003351/http://www.navair.navy.mil/index.cfm?fuseaction=home.NavairNewsStory&id=5411 |archive-date=18 October 2015 |access-date=17 October 2015 |website=NAVAIR News |publisher=Naval Air Systems Command}}</ref> ''Boeing'',<ref name="Boeing_P-8A_Specs">[http://www.boeing.com/defense-space/military/p8a/specs.html "P-8A Poseidon"] {{Webarchive|url=https://web.archive.org/web/20071025035155/http://www.boeing.com/defense-space/military/p8a/specs.html |date=25 October 2007}}. Boeing. Retrieved: 6 July 2007.</ref> and ''others''<ref name="p8 bravado" />
|crew= Flight: two; Mission: seven
|capacity={{convert|19800|lb|kg|abbr=on}}
|length ft=129
|length in=5
|length m=39.47
|span ft=123
|span in=6
|span m=37.64
|height ft=42
|height in=1
|height m=12.83
|empty weight lb=138300
|empty weight kg=62730
|max takeoff weight lb=189200
|max takeoff weight kg=85820
|eng1 name=[[CFM International CFM56|CFM56-7B27A]]
|eng1 type=turbofans
|eng1 number=2
|eng1 lbf=27300
|eng1 kn=121
|max speed kts= 490
|max speed kmh= 907
|max speed mph= 564
|cruise speed kts= 440
|cruise speed kmh= 815
|cruise speed mph= 509
|combat range nmi= 1200
|combat range km= 2225
|combat range note= radius with 4 hours on station for anti-submarine warfare mission<ref>{{Cite web |title=P-8A Poseidon |url=https://www.navair.navy.mil/product/P-8A-Poseidon |access-date=22 April 2023 |publisher=[[NAVAIR]] |archive-date=22 April 2023 |archive-url=https://web.archive.org/web/20230422153927/https://www.navair.navy.mil/product/P-8A-Poseidon |url-status=live}}</ref>
|ferry range nmi=4500
|ferry range km=8300
|ceiling ft=41000
|ceiling m=
|ceiling sigfig=3
|armament= *Hardpoints: 11 total
* Internal bay with 5 hardpoints and 6 external hardpoints for a variety of conventional weapons, e.g. [[AGM-84 Harpoon]], [[AGM-84H/K SLAM-ER]], [[AGM-88 HARM#AGM-88G AARGM-ER|AGM-88G AARGM-ER]],<ref>{{Cite web |date=24 March 2023 |title=AARGM-ER Datasheet |url=https://www.northropgrumman.com/wp-content/uploads/AARGM-ER-Datasheet.pdf |publisher=[[Northrop Grumman]] |id=NG22-2316 |access-date=9 May 2023 |archive-date=9 May 2023 |archive-url=https://web.archive.org/web/20230509110850/https://www.northropgrumman.com/wp-content/uploads/AARGM-ER-Datasheet.pdf |url-status=live}}</ref> [[AGM-158C LRASM]],<ref>{{Cite web |date=4 April 2023 |title=First View of LRASM Missile Aboard a US Navy P-8A Poseidon |url=https://www.navalnews.com/event-news/sea-air-space-2023/2023/04/first-view-of-lrasm-missile-aboard-a-us-navy-p-8a-poseidon/ |access-date=26 May 2023 |archive-date=7 April 2023 |archive-url=https://web.archive.org/web/20230407210313/https://www.navalnews.com/event-news/sea-air-space-2023/2023/04/first-view-of-lrasm-missile-aboard-a-us-navy-p-8a-poseidon// |url-status=live}}</ref> [[Mark 54 torpedo]], [[Sting Ray (torpedo)|Sting Ray torpedo]],<ref>{{Cite web |date=30 November 2023 |title=RAF chooses UK manufactured Sting Ray Torpedo for Poseidon fleet |url=https://www.raf.mod.uk/news/articles/raf-chooses-uk-manufactured-sting-ray-torpedo-for-poseidon-fleet/ |access-date=21 January 2024 |archive-date=16 January 2024 |archive-url=https://web.archive.org/web/20240116102911/https://www.raf.mod.uk/news/articles/raf-chooses-uk-manufactured-sting-ray-torpedo-for-poseidon-fleet/ |url-status=live}}</ref> [[naval mine]]s, [[depth charge]]s, and the ''High Altitude Anti-Submarine Warfare Weapon Capability (HAAWC) system''<ref>{{Cite magazine |last=Majumdar |first=Dave |date=20 April 2012 |title=US Navy to start P-8 operational tests in the summer |url=http://www.flightglobal.com/news/articles/us-navy-to-start-p-8-operational-tests-in-the-summer-370955/ |magazine=[[Flight International]] |archive-url=https://web.archive.org/web/20130419105638/http://www.flightglobal.com/news/articles/us-navy-to-start-p-8-operational-tests-in-the-summer-370955/ |archive-date=19 April 2013 |via=[[FlightGlobal]]}}</ref>
|avionics= *[[Raytheon]] [[AN/APY-10]] multi-mission surface search radar<ref name=Raytheon_APY-10/>
* AN/ALQ-240 Electronic Support Measures Suite<ref name="northropgrumman.com">{{Cite web |title=AN/ALQ-240(V)1 Airborne Maritime Patrol Systems |url=http://www.northropgrumman.com/Capabilities/P8ASensors/Pages/default.aspx |url-status=live |archive-url=https://web.archive.org/web/20170212091717/http://www.northropgrumman.com/Capabilities/P8ASensors/Pages/default.aspx |archive-date=12 February 2017 |access-date=11 February 2017 |website=northropgrumman.com}}</ref>
* [[AN/APS-154 Advanced Airborne Sensor]]<ref>{{Cite web |last=Trevithick |first=Joseph |date=4 May 2020 |title=Behold These Awesome Shots Of A Navy P-8A Poseidon Carrying Its Big Secretive Radar Pod |url=https://www.thedrive.com/the-war-zone/33289/behold-these-awesome-shots-of-a-navy-p-8a-poseidon-carrying-its-big-secretive-radar-pod |url-status=live |archive-url=https://web.archive.org/web/20210729130806/https://www.thedrive.com/the-war-zone/33289/behold-these-awesome-shots-of-a-navy-p-8a-poseidon-carrying-its-big-secretive-radar-pod |archive-date=29 July 2021 |access-date=9 August 2021 |website=The Drive}}</ref>
}}

==See also==
{{Portal||Aviation}}
{{aircontent
|see also= <!-- other related articles that have not already linked: -->
|related= <!-- designs which were developed into or from this aircraft: -->
* [[Boeing C-40 Clipper]]
* [[Boeing E-7 Wedgetail]]
|similar aircraft= <!-- aircraft that are of similar Role, Era, and Capability this design: -->
* [[Airbus A319 MPA]]
* [[BAE Systems Nimrod MRA4]]
* [[Kawasaki P-1]]
* [[Shaanxi KQ-200]]
|lists= <!-- relevant lists that this aircraft appears in: -->
* [[List of active United States military aircraft]]
<!-- See [[WP:Air/PC]] for more explanation of these fields. -->
}}

==References==

===Notes===
{{Reflist}}

===Bibliography===
{{Refbegin}}
* {{Cite book |last=Endres |first=Günter |title=The Illustrated Directory of Modern Commercial Aircraft |date=2001 |publisher=MBI Publishing |isbn=978-0-7603-1125-7 |location=St. Paul, Minnesota |ref=none}}
* {{Cite book |last1=Norris |first1=Guy |title=Modern Boeing Jetliners |last2=Wagner |first2=Mark |date=1999 |publisher=Zenith Imprint |isbn=978-0-7603-0717-5 |location=Minneapolis, Minnesota |ref=none}}
* {{Cite book |last=Shaw |first=Robbie |title=Boeing 737-300 to 800 |date=1999 |publisher=MBI Publishing |isbn=978-0-7603-0699-4 |location=St. Paul, Minnesota |ref=none}}
{{Refend}}

==External links==
{{Commons category}}
* {{Official website}}
* [https://www.navair.navy.mil/product/P-8A-Poseidon U.S. Navy P-8A Poseidon webpage]
* [https://web.archive.org/web/20130728055610/http://navair.navy.mil/index.cfm?fuseaction=home.display&key=CFD01141-CD4E-4DB8-A6B2-7E8FBFB31B86 P-8 NAVAIR page] and [http://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 P-8 fact file on Navy.mil] {{Webarchive|url=https://web.archive.org/web/20070711021443/https://www.navy.mil/navydata/fact_display.asp?cid=1100&tid=1300&ct=1 |date=11 July 2007}}
* [https://web.archive.org/web/20120913144752/http://defence.boeing.com.au/website_33/pages/page_42988/uploads/PPT_AIA-DEV_R4_FINAL%281%29.pdf P-8A Poseidon&nbsp;– Australian International Airshow 2009]
* [http://www.navyrecognition.com/index.php?option=com_content&task=view&id=1347 Boeing P-8A Poseidon Maritime Patrol Aircraft (MPA) Multi-mission Maritime Aircraft (MMA) on navyrecognition.com] {{Webarchive|url=https://web.archive.org/web/20150906170157/http://www.navyrecognition.com/index.php?option=com_content&task=view&id=1347 |date=6 September 2015 }}
* {{Cite news |last=Dominic Gates |author-link=Dominic Gates |date=2 May 2018 |title=Boeing's P-8 is the 737 with missiles, sonar and a specialty in hunting submarines |work=The Seattle Times |url=https://www.seattletimes.com/business/boeing-aerospace/boeings-p-8-is-the-737-with-missiles-sonar-and-a-specialty-in-hunting-submarines/ |ref=none}}

{{Boeing military aircraft}}
{{Boeing 737 family}}
{{US patrol aircraft}}

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[[Category:2000s United States patrol aircraft]]
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[[Category:Aircraft first flown in 2009]]
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