Lockheed Constellation

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Template:Short description Template:Infobox aircraft The Lockheed Constellation ("Connie") is a propeller-driven, four-engined airliner built by Lockheed Corporation starting in 1943. The Constellation series was the first civil airliner family to enter widespread use equipped with a pressurized cabin, enabling it to fly well above most bad weather, thus significantly improving the general safety and ease of commercial passenger air travel.[1]

Several different models of the Constellation series were produced, although they all featured the distinctive triple-tail and dolphin-shaped fuselage. Most were powered by four 18-cylinder Wright R-3350 Duplex-Cyclones. In total, 856 were produced between 1943 and 1958 at Lockheed's plant in Burbank, California, and used as both a civil airliner and as a military and civilian cargo transport. Among their famous uses was during the Berlin and the Biafran airlifts. Three served as the presidential aircraft for Dwight D. Eisenhower, one of which is at the National Museum of the United States Air Force.

Design and development

Initial studies

Lockheed had been working on the L-044 Excalibur, a four-engined, pressurized airliner, since 1937. In 1939, Transcontinental and Western Airlines (TWA), at the instigation of major stockholder Howard Hughes, requested a 40-passenger transcontinental airliner with a range of Template:Convert[2]—well beyond the capabilities of the Excalibur design. TWA's requirements led to the L-049 Constellation, designed by Lockheed engineers, including Kelly Johnson and Hall Hibbard.[3] Willis Hawkins, another Lockheed engineer, maintains that the Excalibur program was purely a cover for the Constellation.[4]

File:Superconstellation2594.jpg
A preserved C-121C Super Constellation, registration N73544, in flight in 2004

Development of the Constellation

The Constellation's wing design was close to that of the Lockheed P-38 Lightning, differing mostly in size.Template:Sfn The triple tail allowed the aircraft to fit into existing hangars,[4] while features included hydraulically boosted controls and a deicing system used on wing and tail leading edges.[2] The aircraft had a maximum speed over Template:Convert, faster than that of a Japanese Zero fighter, a cruise speed of Template:Convert, and a service ceiling of Template:Convert.

According to Anthony Sampson in Empires of the Sky, Lockheed may have undertaken the intricate design, but Hughes's intercession in the design process drove the concept, shape, capabilities, appearance, and ethos.Template:Sfn These rumors were discredited by Johnson. Howard Hughes and Jack Frye confirmed that the rumors were false in a letter dated November 1941.Template:Sfn

Operational history

World War II

File:Lockheed Constellation 1943 NAN15Feb43.jpg
The first Lockheed Constellation on January 9, 1943
File:Lockheed Constellation Record 1944.ogv
1944 newsreel about a Constellation flight from California to Washington, D.C.

With the onset of World War II, the TWA aircraft entering production were converted to an order for C-69 Constellation military transport aircraft, with 202 aircraft intended for the United States Army Air Forces (USAAF). The first prototype (civil registration NX25600) flew on January 9, 1943, a short ferry hop from Burbank to Muroc Field for testing.[2] Edmund T. "Eddie" Allen, on loan from Boeing, flew left seat, with Lockheed's own Milo Burcham as copilot. Rudy Thoren and Kelly Johnson were also aboard.

Lockheed proposed the model L-249 as a long-range bomber. It received the military designation XB-30, but the aircraft was not developed. A plan for a very long-range troop transport, the C-69B (L-349, ordered by Pan Am in 1940 as the L-149),[5] was cancelled. A single C-69C (L-549), a 43-seat VIP transport, was built in 1945 at the Lockheed-Burbank plant.

The C-69 was mostly used as a high-speed, long-distance troop transport during the war.Template:Sfn In total, 22 C-69s were built before the end of hostilities, but seven of these never entered military service, as they were converted to civilian L-049s on the assembly line. The USAAF cancelled the remainder of the order in 1945. Some aircraft remained in USAF service into the 1960s, serving as passenger ferries for the airline that relocated military personnel, wearing the livery of the Military Air Transport Service.

Postwar use

File:Lockheed L749A N6022C TWA Connie final.jpg
TWA L-749A Constellation at Heathrow in 1954 with an under fuselage "Speedpack" freight container
File:SCFA-Connie.JPG
Super Constellation (C-121C) during pilot training in Epinal – Mirecourt, France

After World War II, the Constellation came into its own as a fast civilian airliner. Aircraft already in production for the USAAF as C-69 transports were finished as civilian airliners, with TWA receiving the first on 1 October 1945. TWA's first transatlantic proving flight departed Washington, D.C., on December 3, 1945, arriving in Paris on December 4 via Gander and Shannon.[2]

TWA transatlantic service started on February 6, 1946, with a New York-Paris flight in a Constellation. On June 17, 1947, Pan American World Airways (Pan Am) opened the first-ever scheduled round-the-world service with its L-749 Clipper America. The famous flight "Pan Am 1" operated until 1982.Script error: No such module "Unsubst".

As the first pressurized airliner in widespread use, the Constellation helped establish affordable and comfortable air travel. Operators of Constellations included TWA, Eastern Air Lines, Pan Am, Air France, BOAC, KLM, Qantas, Lufthansa, Iberia Airlines, Panair do Brasil, TAP Portugal, Trans-Canada Air Lines (later renamed Air Canada), Aer Lingus, VARIG, Cubana de Aviación, Línea Aeropostal Venezolana, Northwest Airlines, and Avianca, the national airline of Colombia.

Records

Sleek and powerful, Constellations set many records. On April 17, 1944, the second production C-69, piloted by Howard Hughes and TWA president Jack Frye, flew from Burbank, California, to Washington, D.C., a distance of approximately Template:Convert, in 6 hours and 57 minutes, representing an average speed of Template:Convert. On the return trip, the aircraft stopped at Wright Field in Ohio to give Orville Wright his last flight, more than 40 years after his historic first flight near Kitty Hawk, North Carolina. He commented that the Constellation's wingspan was longer than the distance of his first flight.[3]

On September 29, 1957, a TWA L-1649A flew from Los Angeles to London in 18 hours and 32 minutes—about Template:Convert at Template:Convert.[6] The L-1649A holds the record for the longest-duration, nonstop passenger flight aboard a piston-powered airliner. On TWA's first London-to-San Francisco flight on October 1–2, 1957, the aircraft stayed aloft for 23 hours and 19 minutes (about Template:Convert at Template:Convert).[7]

Obsolescence

File:Lockheed L1049H CF-NAM Nordair MAN 02.07.66 edited-2.jpg
L-1049H freighter of Nordair Canada at Manchester Airport in 1966
File:Constellation L-049.jpg
A Lockheed Constellation L-049 preserved at TAM Museum

Jet airliners such as the de Havilland Comet, Boeing 707, Douglas DC-8, Convair 880, and Sud Aviation Caravelle rendered the Constellation obsolete. The first routes lost to jets were the long overseas routes, but Constellations continued to fly domestic routes. The last scheduled passenger flight of a Constellation in the contiguous United States was made by a TWA L749 on May 11, 1967, from Philadelphia to Kansas City, Missouri;[8] the last scheduled passenger flight in North America was by Western Airlines' N86525 in Alaska, Anchorage to Yakutat to Juneau on 26 November 1968.

Constellations carried freight in later years, and were used on backup sections of Eastern Airlines' shuttle service between New York, Washington, and Boston until 1968. Propeller airliners were used on overnight freight runs into the 1990s, as their low speed was not an impediment. An Eastern Air Lines Connie holds the record for a New York–to–Washington flight from take off to touchdown in just over 30 minutes. The record was set prior to speed restrictions by the Federal Aviation Administration (FAA) below Template:Convert.[9]

One of the reasons for the elegance of the aircraft was the dolphin-shaped fuselage, a continuously variable profile with no two bulkheads the same shape and a skin formed into compound curves, which was expensive to build. Manufacturers have since favored tube-shaped fuselages in airliner designs, as the cylindrical cross-section design is more resistant to pressurization changes and less expensive to build.

After ending Constellation production, Lockheed chose not to develop a first-generation jetliner, sticking to its military business and production of the turboprop Lockheed L-188 Electra. Lockheed did not build a large passenger aircraft again until its L-1011 Tristar debuted in 1972. While a technological marvel, the L-1011 was a commercial failure, and Lockheed left the commercial airliner business permanently in 1983.Template:Sfn

Variants

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File:Super Constellation at Salisbury Airport Rhodesia.JPG
Super Constellation at Charles Prince Airport, Rhodesia (now Zimbabwe) in 1975, used as a flying club headquarters
File:Lockheed R7V-2 turboprop Connie in flight c1953.jpeg
A United States Navy R7V-2 (L-1249) in flight: The L-1249 used Pratt & Whitney T34 turboprop engines in place of the Wright R-3350 radials.[10]

The initial military versions carried the Lockheed designation of L-049; as World War II came to a close, some were completed as civilian L-049 Constellations followed by the L-149 (L-049 modified to carry more fuel tanks).

The first purpose-built passenger Constellations were the more powerful L-649 and L-749 (which had more fuel in the outer wings),[5]Script error: No such module "Unsubst". L-849 (an unbuilt model to use the R-3350 turbo-compound engines adopted for the L-1049 ), L-949 (an unbuilt, high-density seating-cum-freighter type, what would come to be called a "combi aircraft").[5]

These were followed by the L-1049 Super Constellation (with longer fuselage), L-1149 (proposal to use Allison turbine engines)[5] and L-1249 (similar to L-1149, built as R7V-2/YC-121F),[5] L-1449 (unbuilt proposal for L1049G, stretched Template:Convert, with new wing and turbines)[5] and L-1549 (unbuilt project to stretch L-1449 Template:Convert).[5]

The final civilian variant was the L-1649 Starliner (all new wing and L1049G fuselage).[5]

Military versions included the C-69 and C-121 for the Army Air Forces/Air Force and the R7O R7V-1 (L-1049B) EC-121 WV-1 (L-749A) WV-2 (L-1049B) (widely known as the Willie Victor) and many variant EC-121 designations for the Navy.[11][12]

Operators

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File:Constellation Wiki.jpg
Lockheed Super Constellation of Lufthansa.

After TWA's initial order was filled following World War II, customers rapidly accumulated, with over 800 aircraft built. In military service, the U.S. Navy and Air Force operated the EC-121 Warning Star variant until 1978, nearly 40 years after work on the L-049 began. Cubana de Aviación was the first airline in Latin America to operate Super Constellations.

Surviving aircraft

File:SUPER CONSTELLATION FUSELAGE DISPLAYED ABOVE BUILDING DEEP IN EVERGLADES - NARA - 544610.jpg
Constellation fuselage on display on Oasis gas station, Tamiami Trail Florida, 1971[13]
File:Lockheed L-1049 G Super Constellation (D-ALEM).JPG
Lockheed L-1049G Super Constellation D-ALEM on display close to Munich International Airport

Commercial

On display
L-049
L-749
L-1049 Super Constellation
File:Korean L-049 on display.jpg
Korea Air L-1049 on display at Jeju island the former N494TW painted as HL4003
L-1649 Starliner
  • N974R – on display in front of the Fantasy of Flight attraction in Lakeland, Florida.[23]
  • ZS-DVJ – On display at Rand Airport in Germiston in Trek Airways colours.[24] Used to be at OR Tambo International Airport, South Africa at the South African Airways Technical area. The aircraft is owned by the South African Airways Museum Society.[25]
Under restoration or in storage
L-049
  • N7777G – painted in TWA colors (although this aircraft never flew for TWA) it is stored at the Large Item Storage facility for the UK Science Museum at Wroughton, near Swindon. This aircraft was used by the Rolling Stones to transport equipment during their 1973 Australian tour.[26] It is the only Constellation in the United Kingdom.[27]
L-1049 Super Constellation
  • F-BRAD – to display by the Amicale du Super Constellation located at the Nantes Airport in Nantes, France. It was delivered to Air France on November 2, 1953, and was upgraded to a L-1049 G in 1956, serving until August 8, 1967, having totaled 24,284 hours under Air France's colors. After retirement, it was sent to Spain, to be registered EC-BEN, briefly flying humanitarian and medevac missions in Biafra. Aero Fret bought it in 1968, brought it back home to France, registered it as F-BRAD, and operated it on cargo hauls until 1974. When the Constellation landed in Nantes one last time to be scrapped, it was ultimately saved by Mr. Gaborit, who revamped it somewhat by his own modest means to finally park it near the terminal, accessible to visitors for a few years, until the Chamber of Commerce and Industry of the Nantes-Atlantique Airport bought it, to contract the Amicale du Super Constellation to undergo a complete restoration of the aircraft.[28]
  • HI-542CT City of Miami – parked on an unused runway at the Rafael Hernández Airport in Aguadilla, Puerto Rico. It was struck by a runaway DC-4 on February 3, 1992, resulting in damage to the right wing and main spar.[29]
  • N6937C Star of America – to airworthiness by the National Airline History Museum in Kansas City, Missouri. This aircraft was originally built in 1957, stored for several years, and then delivered to cargo carrier Slick Airways. It was restored in 1986 by the Save-a-Connie, Inc. organization, later renamed as the National Airline History Museum. It was originally painted in red and white with Save-a-Connie, but was later repainted in the 1950s livery of TWA to resemble its original Star of America Constellation.[30] The aircraft appeared at New York's John F. Kennedy International Airport at the original TWA terminal designed by Eero Saarinen to commemorate the 75th anniversary of the airline with the paint scheme donated by TWA in Kansas City for the occasion. The Star of America has appeared at many airshows and was even used in The Aviator, the 2004 film depicting the life of TWA's one-time owner Howard Hughes, the man often credited with helping design and develop the original Constellation series.[31]
L-1649 Starliner
  • N7316C – returned to airworthiness by Lufthansa Technik North America in Auburn, Maine. This aircraft was purchased at auction in 2007, along with C/N 1038, by the Deutsche Lufthansa Berlin Foundation. Lufthansa has built a hangar at the airport, which will allow the aircraft to be restored indoors. Lufthansa announced in March 2018 that it will be transported back to Germany and further restoration decisions will be made after it arrives.[32][33] As of the end of 2019 the plan is to restore the aircraft for static display in a museum. According to reports from the US, the aircraft was dismantled (as apparently was the Ju-52 D-AQUI) without the requisite documentation that would have allowed the return-to-flight work to continue.
  • N8083H – This aircraft was purchased at auction in 2007, along with C/N 1018, by the Deutsche Lufthansa Berlin Foundation, and stripped of all usable spares to support the restoration of C/N 1018. The aircraft was subsequently sold and transported to JFK International Airport to become a cocktail bar in the TWA Hotel, a retro-aviation themed hotel built on the former TWA Flight Center.[34]

Military

File:Lockheed C-121C Super Constellation, Super Constellation Flyers Association JP6615666.jpg
The Breitling Super Constellation
Airworthy
C-121C
  • S/N 54-0156 – Flies with the Super Constellation Flyers Association out of Basel, as the Breitling Super Constellation. Its restoration was sponsored by Swiss watch manufacturer Breitling, and is now registered in the Swiss Aircraft registry as HB-RSC. This Constellation is one of two flying in the world.[35]
File:HARS Super Connie at Woollongong.jpg
HARS Super Connie at Wollongong, 2004
  • S/N 54-0157 – Flies with the Historical Aircraft Restoration Society (HARS) out of Shellharbour Airport near Wollongong, Australia. Following its restoration, it was painted in pseudo-Qantas livery, including the Qantas logo on the tail, (with the usual Qantas lettering along the fuselage and on the wing-end fuel tanks replaced with the word "CONNIE") and registered as VH-EAG. This Constellation is the other of two flying in the world.[36]
  • S/N 48-0613 Bataan – Restored to airworthiness by Lewis Air Legends in San Antonio, Texas. This aircraft was used as a personal transport by General Douglas MacArthur during the Korean War, and later by other Army general officers until 1966, when it was transferred to NASA. Following its permanent retirement in 1970, it was placed on display at a museum at Fort Rucker near Daleville, Alabama. It was acquired by the Planes of Fame Air Museum at Chino, California, in 1992, and overhauled into airworthy condition for a flight to Dothan, Alabama, where it received additional work. After a thorough restoration back to its original configuration with a "VIP interior", it was placed on display at the Planes of Fame secondary location in Valle, Arizona. Then, in 2015, it was sold to Lewis Air Legends, and prepped for a ferry flight to Chino, arriving there on January 14, 2016. On June 20, 2023, the Air Legends Foundation’s Lockheed VC-121A Constellation took off on its first post-restoration flight from Chino Airport. The aircraft flew to the 2023 EAA AirVenture Oshkosh in Oshkosh, Wisconsin.[37]
On display
  • N8083H – L-1649A on display at the TWA Hotel at John F. Kennedy International Airport in New York City, restored as a 1960s-themed cocktail lounge known as the "Connie Cocktail Lounge". Formerly used by TWA and restored in 2018–2019.[38]
VC-121A
  • S/N 48-0609 – on display at Jeongseok Airport on Jeju Island, South Korea. It was donated to Korean Air in 2005, and restored to airworthy condition at Tucson, Arizona. It was then ferried to South Korea, where it made its final flight, under its own power, from Seoul to its current location for static display. It has been repainted in 1950s Korean Air colors, and rendered unable to fly by the presence of unserviceable engines.[39]
File:Lockheed Constellation N749NL Aviodrome.JPG
L-749A restored at Aviodrome
  • S/N 48-0612 – on display at the Dutch National Aviation Museum Aviodrome. It was restored to airworthy condition and ferried from Tucson, Arizona, to the Netherlands, where restoration continued. It is now painted in the KLM livery of the 1950s, depicting a KLM Lockheed L-749A. Renamed Flevoland, this was the only airworthy example of the "short" version of the Constellation until an engine failure grounded the aircraft.
  • S/N 48-0614 Columbine – on display at the Pima Air and Space Museum in Tucson, Arizona. This aircraft was used by Dwight D. Eisenhower during his role as Supreme Headquarters Allied Powers Europe commander before he became president. It is on loan from the National Museum of the U.S. Air Force.[40]
VC-121E
File:Lockheed VC-121E Super Constellation.jpg
Dwight D. Eisenhower flew in three Constellations, named Columbine, Columbine II, and Columbine III.
C-121C
File:20180328 C-121 Constellation Udvar-Hazy.jpg
C-121 on display at the Udvar-Hazy Center
C-121J
EC-121K
EC-121T
File:Lockheed Constellation Topeka.jpg
N4257U on display at the Combat Air Museum in Topeka
Under restoration or in storage
WV-1
  • BuNo 124438 – to airworthiness by Gordon Cole at Salina, Kansas. This aircraft was the first of two WV-1s delivered to the U.S. Navy in 1949. Essentially, it was a prototype for the EC-121 Warning Star that followed. Retired from the Navy in 1957, it served the FAA from 1958 to 1966, before being flown to Salina in 1967 for retirement. It remains parked there, and was last flown in 1992.[50]
VC-121A
  • S/N 48-0610 Columbine II – to airworthiness by Dynamic Aviation in Bridgewater, Virginia. This aircraft served as the first Air Force One, during the presidency of Dwight D. Eisenhower, before it was replaced by Columbine III as Eisenhower's primary presidential aircraft in 1954. After a long period of storage at Marana Regional Airport, near Tucson, Arizona, this aircraft made its first flight, since 2003, in March 2016, when it was ferried to Bridgewater for additional restoration.[51][52][53][54]
EC-121T

Specifications (L-1049G Super Constellation)

Lockheed C-121C (L-1049) Super Constellation.
Lockheed C-121C (L-1049) Super Constellation.

Template:Aircraft specs

Accidents and incidents

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See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

References

Template:Reflist

Bibliography

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  • Script error: No such module "citation/CS1".
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  • Marson, Peter J. The Lockheed Constellation Series. Tonbridge, Kent, UK: Air-Britain (Historians), 1982. Template:ISBN.
  • Script error: No such module "citation/CS1".
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  • Smith, M. J. Jr. Passenger Airliners of the United States, 1926–1991. Missoula, Montana: Pictorial Histories Publishing Company, 1986. Template:ISBN.
  • Script error: No such module "citation/CS1".
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  • United States Air Force Museum Guidebook. Wright-Patterson AFB, Ohio: Air Force Museum Foundation, 1975.
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Template:Refend

External links

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Template:Lockheed Martin aircraft Template:Lockheed Constellation family Template:USAF transports Template:USN transports Template:USN patrol aircraft

Template:Authority control

  1. ↑ Historic airliner trucked 300 miles to be a hotel bar CNN Travel. By Thom Patterson. 13 October 2018. Downloaded Oct. 21, 2018.
  2. ↑ a b c d Script error: No such module "Footnotes".
  3. ↑ a b Script error: No such module "Footnotes".
  4. ↑ a b Script error: No such module "Footnotes".
  5. ↑ a b c d e f g h Script error: No such module "Footnotes".
  6. ↑ Template:Cite magazine
  7. ↑ Script error: No such module "citation/CS1".Template:Dead link Longer Range, New Routes. Retrieved July 26, 2020.
  8. ↑ Script error: No such module "Footnotes".
  9. ↑ "Lockheed Constellation L749 N749NL Comeback." Template:Webarchive World News. Retrieved: February 22, 2011.
  10. ↑ Alternate Wars.com – R7V-2 Standard Aircraft Characteristics Template:Webarchive; Retrieved 10/12/11
  11. ↑ Swanborough, Gordon and Peter M. Bowers. United States Navy Aircraft Since 1911. Annapolis, Maryland: Naval Institute Press, 1976. Template:ISBN.
  12. ↑ Fahey, James C. The Ships and Aircraft of the U.S. Fleet, volumes 1–4, 1939–45. Annapolis, Maryland: Naval Institute Press, 1965.
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ "Lockheed L-049 Constellation." Template:Webarchive Pima Air & Space Museum. Retrieved: July 18, 2009.
  15. ↑ "Lockheed Constellation, A majestade dos ares (in Portuguese). Template:Webarchive Museum Asas de um Sonho (Portugal). Retrieved: July 18, 2009.
  16. ↑ Pettersen, Ralph M. "N9412H c/n 2072." Template:Webarchive Constellation Survivors, 2011. Retrieved: February 22, 2011.
  17. ↑ Kinder, Steve. "AirlineFan: AeroSur Constellation N2520B in AeroSur Colors" Template:Webarchive "AirlineFan: AeroSur Constellation N2520B in AeroSur Colors", 2008. Retrieved: June 17, 2012.
  18. ↑ "F-ZVMV c/n 2503." Template:Webarchive conniesurvivors.com. Retrieved: July 18, 2009.
  19. ↑ Bogash, Robert "Super Constellation CF-TGE." Template:Webarchive rbogash.com. Retrieved: November 3, 2011.
  20. ↑ Petersen, Ralph M. "CF-TGE c/n 4544." Template:Webarchive conniesurvivors.com. Retrieved: November 3, 2011.
  21. ↑ "Lockheed L-1049 G Super Constellation" Template:Webarchive Munich Airport Retrieved: August 31, 2009.
  22. ↑ "N4247K c/n 4144." Template:Webarchive conniesurvivors.com. Retrieved: November 21, 2010.
  23. ↑ Pettersen, Ralph M. "N974R c/n 1040." Template:Webarchive Constellation Survivors, 2011. Retrieved: February 22, 2011.
  24. ↑ Script error: No such module "citation/CS1".
  25. ↑ "Lockheed L1649A Starliner, ZS-DVJ, c/n 1042." Template:Webarchive The South African Airways Museum Society via saamuseum.co.za. Retrieved: July 18, 2009.
  26. ↑ Script error: No such module "citation/CS1".
  27. ↑ Hayles, John. "Science Museum Swindon: Constellation N7777G." Template:Webarchive aeroflight.co.uk, July 4, 2009. Retrieved: July 18, 2009.
  28. ↑ "Story of F-BGNJ." Template:Webarchive Amicale du Super Constellation. Retrieved: March 23, 2010.
  29. ↑ Pettersen, Ralph M. "HI-542CT c/n 4825." Template:Webarchive Constellation Survivors, 2011. Retrieved: February 22, 2011.
  30. ↑ "N6937C Lockheed Super Constellation "Star of America." Template:Webarchive Airline History Museum at Kansas City.Retrieved: July 18, 2009.
  31. ↑ Denning, Larry. "Connie at the Movies." Template:Webarchive Airline History Museum at Kansas City. Retrieved: July 18, 2009.
  32. ↑ Script error: No such module "citation/CS1".
  33. ↑ Script error: No such module "citation/CS1".
  34. ↑ "Vintage 'Connie' flying from Maine to NYC to become hotel cocktail lounge" Template:Webarchive USA Today via usatoday.com. Retrieved: October 10, 2018.
  35. ↑ Pettersen, Ralph M. "Breitling Super Constellation. After the discovery of corrosion, it was grounded for a time, but is flying again after extensive repairs." Template:Webarchive conniesurvivors.com, May 2004. Retrieved: July 18, 2009.
  36. ↑ "Historical Aircraft Restoration Society Super Constellation." Template:Webarchive hars.org.au. Retrieved: January 30, 2012.
  37. ↑ Script error: No such module "citation/CS1".
  38. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named TWAConnie
  39. ↑ Pettersen, Ralph M. "N494TW c/n 2601." Template:Webarchive Constellation Survivors, 2011. Retrieved: February 22, 2011.
  40. ↑ Pima Air and Space Museum webpage Template:Webarchive. Retrieved 2013-11-05
  41. ↑ Petersen, Ralph M. "53-7885 c/n 4151." Template:Webarchive Lockheed Constellation Survivors. Retrieved: 16 July 2013.
  42. ↑ "C-121A." Template:Webarchive National Air and Space Museum. Retrieved 9 March 2018.
  43. ↑ Script error: No such module "citation/CS1".
  44. ↑ "N4247K." Template:Webarchive conniesurvivors.com. Retrieved: November 23, 2010.
  45. ↑ Script error: No such module "citation/CS1".
  46. ↑ "EC-121D." Aerospace Museum of California. Retrieved: January 20, 2013.
  47. ↑ "EC121T". Template:Webarchive petemuseum.org. Retrieved: November 21, 2010.
  48. ↑ "Lockheed EC-121T Constellation." Template:Webarchive Pima Air & Space Museum. Retrieved: July 18, 2009.
  49. ↑ Lockheed EC-121D Constellation National Museum of the United States Air Force via nationalmuseum.af.mil. Retrieved: July 23, 2019.
  50. ↑ Script error: No such module "citation/CS1". Salina Connie. Retrieved February 16, 2013.
  51. ↑ Script error: No such module "citation/CS1".
  52. ↑ Script error: No such module "citation/CS1".
  53. ↑ Script error: No such module "citation/CS1".
  54. ↑ Script error: No such module "citation/CS1".
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