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{{Short description|Four-engine propeller-driven airliner
{{Redirect|DC-4|the original aircraft designated "DC-4"|Douglas DC-4E|other uses|DC4 (disambiguation)}}
{{Use dmy dates|date=March 2022}}
{{Use American English|date=April 2023}}
|name= DC-4
|image= File:American Airlines NC90423.jpg
|caption=
|type= [[Airliner]]/[[cargo aircraft|transport aircraft]]
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|manufacturer= [[Douglas Aircraft Company]]
|designer=
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|retired= 1991
|status= In very limited use
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|produced=1942 – August 1947
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|variants
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The '''Douglas DC-4''' is an American four-engined (piston), propeller-driven [[airliner]] developed by the [[Douglas Aircraft Company]]. Military versions of the plane, the [[Douglas C-54 Skymaster|C-54]] and R5D, served during [[World War II]], in the [[Berlin Airlift]] and into the 1960s. From 1945, many civil airlines operated the DC-4 worldwide.
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[[File:Pan Am DC4 Cipper.jpg|thumb|[[Pan Am]] DC-4 in [[Trinidad]] in the 1950s]]
To meet military requirements, the first production aircraft had four additional auxiliary fuel tanks in the main cabin, which reduced the passenger seats to 26. The following batch of aircraft was the first built to military specifications, and was designated C-54A and built with a stronger floor and a cargo door with a hoist and winch. The first C-54A was delivered in February 1943. With the introduction of the C-54B in March 1944, the outer wings were changed to hold integral fuel tanks, allowing two of the cabin tanks to be removed; this allowed 49 seats (or 16 stretchers) to be fitted. The C-54C was a hybrid for Presidential use
The most common variant was the C-54D, which entered service in August 1944, essentially a C-54B with more powerful R-2000-11 engines. With the C-54E the last two cabin fuel tanks were moved to the wings, which allowed more freight or 44 passenger seats.
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Douglas continued to develop the type during the war in preparation for a return to airline use when peace returned. Sales of new aircraft had to compete against 500 wartime ex-military C-54s and R5Ds which came onto the civilian market, many of which were converted to DC-4 standard by Douglas. DC-4s were a favorite of [[charter airline]]s such as [[Great Lakes Airlines]], [[North American Airlines]], [[Universal Airlines (United States)|Universal Airlines]], and [[Transocean Airlines]]. In the 1950s, Transocean ([[Oakland]], [[California]]) was the largest civilian C-54/DC-4 operator.
[[File:Aerolineas Argentinas DC4 atEZE 1958.jpg|thumb|[[Aerolíneas Argentinas]] DC-4 starting engines at Buenos Aires international airport
[[File:Douglas DC-4 Pan Am.jpg|thumb|[[Pan American World Airways|Pan American]] DC-4 in flight]]
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A total of 330 DC-4s and C-54s were used in the Berlin Airlift, which made them one of the most numerous types involved.
Purchasers of new-build DC-4s included [[Pan American Airways]], [[National Airlines (NA)|National Airlines]], [[Northwest Airlines]], and [[Western Airlines]] in the US, and [[KLM]] Royal Dutch Air Lines, [[Scandinavian Airlines System]], [[Iberia (airline)|Iberia]] Airlines of Spain, [[Swissair]], [[Air France]], [[Sabena]] Belgian World Airlines, [[Cubana de Aviación]], [[Avianca]], [[Aerolíneas Argentinas]], [[Aeropostal]] of [[Venezuela]] (1946), and [[South African Airways]] overseas.<ref>Berry 1967, pp. 70–73.</ref> Several airlines used new-build DC-4s to start scheduled transatlantic flights between Latin America and Europe. Among the earliest were Aerolíneas Argentinas
Basic prices for a new DC-4 in 1946–47 were around £140,000-{{Inflation|UK|160,000|1946|fmt=eq|orig=yes|cursign=£}}. In 1960, used DC-4s were available for around {{Inflation|UK|80,000|1960|fmt=eq|orig=yes|cursign=£}}.<ref>{{cite journal |url=http://www.flightglobal.com/pdfarchive/view/1960/1960%20-%202687.html |title=de havilland {{!}} 1960 {{!}} 2687 {{!}} Flight Archive |journal=Flight |date=18 November 1960 |access-date=28 February 2017}}</ref>
{{As of|2020|June}}, two DC-4s were used for charters in [[South Africa]] by the [[South African Airways Museum Society]], with both aircraft (ZS-BMH and ZS-AUB) carrying historical [[South African Airways]] livery.<ref>{{cite web |url=http://flyskyclass.com/portfolio/skyclassic/#tab-1396342235-2-97 |title=SkyClassic |website=SkyClass Aviation |location=South Africa |access-date=7 June 2020 |archive-date=7 June 2020 |archive-url=https://web.archive.org/web/20200607015148/http://flyskyclass.com/portfolio/skyclassic/#tab-1396342235-2-97 |url-status=dead }}</ref><ref>{{cite web |url=http://www.saamuseum.co.za/our-aircraft.html |title=Our Aircraft |website=[[South African Airways Museum Society]] |location=South Africa |access-date=7 June 2020}}</ref>
[[Buffalo Airways]] of [[Yellowknife, Northwest Territories]] continues to operate the type commercially.<ref>{{cite news |last=Stapleton|first=Rob |url=http://www.alaskajournal.com/community/2009-08-14/brooks-fuel-keeps-alaska-supplied-using-legacy-aircraft |title=Brooks Fuel keeps Alaska supplied using legacy aircraft |newspaper=Alaska Journal of Commerce |date=15 August 2009 |access-date=27 February 2017}}</ref>
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Very few DC-4s remain in service today.<ref>Blewett 2007, p. 101.</ref>
*The last two passenger DC-4s operating worldwide are based in Johannesburg, South Africa. They fly with old South African Airways (SAA) livery. They are ZS-AUB ''Outeniqua'' and ZS-BMH ''Lebombo'' and are owned by the South African Airways Museum Society<ref name="Outeniqua">{{cite web |url=http://www.saamuseum.co.za/our-aircraft/70.html |title="Outeniqua" Douglas DC-4 1009 ZS-AUB c/n 42984 |publisher=South African Airways Museum Society |access-date=21 January 2015}}</ref><ref name="Lebombo">{{cite web |url=http://www.saamuseum.co.za/our-aircraft/73.html |title="Lebombo" Douglas DC-4 1009 ZS-BMH c/n 43157 |publisher=South African Airways Museum Society |access-date=21 January 2015}}</ref> and operated by Skyclass Aviation,<ref>{{cite web |url=http://flyskyclass.com/portfolio/skyclassic/ |title=Portfolios: SkyClassic |publisher=SkyClass Aviation |date=31 March 2014 |access-date=20 January 2015 }}{{Dead link|date=September 2024 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> a company specialising in classic and VIP charters to exotic destinations in Africa.
*A 1944-built DC-4/C-54 is on display at [[Historical Aircraft Restoration Society]] in [[New South Wales]], Australia, with a planned restoration to airworthiness.<ref>{{cite web |url=https://www.thesenior.com.au/story/8009136/world-war-ii-era-aeroplanes-to-fly-high-again/?cs=6744 |title=DC4, Vampire planes on display at HARS Aviation Museum Tarmac Days in December 2022 |website=thesenior.com.au |access-date=5 January 2023 |date=7 December 2022 }}</ref>
*A 1945-built DC-4 (C-54D) 43-17228 is being operated by Berlin Airlift Historical Foundation as a flying museum of the Berlin Airlift. Called the ''Spirit of Freedom'', it replaced a previous C-54 (44-9144) damaged by a tornado in 2020.<ref>{{cite web |url=http://www.spiritoffreedom.org |title=Berlin Airlift Historical Foundation |access-date=25 August 2021}}</ref>
*One ex-[[Buffalo Airways]] DC-4<ref>{{Cite web|title = Douglas DC-4 "Oil Bomber" Spray Plane at KCGI|url = http://www.semissourian.com/story/1739871.html|website = seMissourian.com|date = 28 June 2011|access-date=9 February 2016}}</ref> (N55CW c/n 10673, currently registered to Aircraft Guaranty Corp Trustee) is fitted with spray bars on top of the wings and is currently based in Florida on standby for oil pollution control.<ref>{{cite web|url=http://de.flightaware.com/resources/registration/N55CW|title=N55CW (1942 DOUGLAS C54D-DC owned by AIRCRAFT GUARANTY CORP TRUSTEE) Aircraft Registration ✈ FlightAware}}</ref>▼
▲*One ex-Buffalo DC-4<ref>{{Cite web|title = Douglas DC-4 "Oil Bomber" Spray Plane at KCGI|url = http://www.semissourian.com/story/1739871.html|website = seMissourian.com|date = 28 June 2011|access-date=9 February 2016}}</ref> (N55CW c/n 10673, currently registered to Aircraft Guaranty Corp Trustee) is fitted with spray bars on top of the wings and is currently based in Florida on standby for oil pollution control.<ref>{{cite web|url=http://de.flightaware.com/resources/registration/N55CW|title=N55CW (1942 DOUGLAS C54D-DC owned by AIRCRAFT GUARANTY CORP TRUSTEE) Aircraft Registration ✈ FlightAware}}</ref>
*A 1945-built C-54 (C-54E-5-DO) c/n 27289, USAAF serial 44-9063, was recovered from Reconstruction Finance Corporation by Douglas aircraft for conversion to DC-4. It served with Pan American World Airways from 1946 to 1952 as NC-88887, then with a succession of carriers and private owners until retired in 1989 as N88887. Around 1990 it was placed on display at the Berlin Airlift Memorial at Frankfurt Airport.<ref>{{cite web |url=https://www.planelogger.com/Aircraft/Registration/N88887/629654 |title=Registration Details for N88887 |work=PlaneLogger |access-date=22 November 2021}}</ref>
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==Bibliography==
* {{cite journal |last=Aro
* {{cite book |last1=Berry
* {{cite book |last=Blewett
* {{cite book |last=Francillon
* {{cite journal |last1=Griffith |first1=Alan |title=Ploughshares into Swords: The Douglas DC-4/4E Bomber Projects |journal=The Aviation Historian |date=2019 |issue=28 |pages=20–31 |issn=2051-1930}}
* {{cite book |last=Pearcy
* {{cite book |last=Yenne
==External links==
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