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{{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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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>
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