List of Douglas DC-4 operators

 Aden

• Aden Airways^{Note 1}

 Algeria

• Air Algerie^[1]

 Antigua and Barbuda

• Seagreen Air Transport ^[1]

 Argentina

• Aerolíneas Argentinas^[1]
• Aerotransportes Entre Rios^[2]
• Aerovias Halcon^[3]
• Flota Aérea Mercante Argentina [de] (FAMA)^[1]

 Australia

• Air Express
• Ansett-ANA^{Note 2}
• Australian National Airways^[1]
• British Commonwealth Pacific Airlines
• Pacific Air Freighters
• Qantas^[1]
• Trans Australia Airlines^[1]

 Barbados

• Carib West Airways

 Belgium

• SABENA^[1]
• Avions Fairey
• Belgian International Air Services

 Bolivia

• Frigorifico Reyes

 Burundi

• King of Burundi^{Note 1}

 Cameroon

• Air Cameroun (Societie Anonyme des Avions Meyer et Compagnie)^[1]
• Cameroon Airlines

 Canada

• Air North
• Buffalo Airways
• Eldorado Aviation^[1]
• Canadian Pacific Airlines^{Note 1}
• Trans-Canada Airlines^{Note 1}
• World Wide Airways^{Note 1}
• Curtiss Reid Flying Services Canada
• Kenting Aviation
• Maritime Central Airways
• Millardair
• Nordair
• Pacific Western
• Soundair
• Transair^[1]

 Chad

• Air Tchad^[4]

 Republic of China

• China Airlines
• Civil Air Transport

 Colombia

• Avianca^[1]
• SATENA

 Democratic Republic of the Congo

• Air Congo^[1]

 Denmark

• Det Danske Luftfartselskab (DDL)
• Flying Enterprise - Canadair North Star

 Ecuador

• Aerovias Ecuatorianas^[3]

 El Salvador

• TACA International Airlines^[1]

 France

• Air France^[1]
• Compagnie Air Transport [de]

 Gabon

• Transgabon^[1]

 Germany

• Aerotour^[1]
• All-Air^[1]
• Continentale Deutsche Luftreederei [de]^[1]
• LTU International^[1]
• Luftreederei Karl Herfurtner^[1]
• Transavia Flug [de]^[1]
• Transportflug^[1]

 Greece

• Olympic Airways^[1]

 Guatemala

• Aviateca

 Hong Kong

• Cathay Pacific Airways

 India

• Indian Airlines^[5]

 Iceland

• Icelandair
• Loftleidir

 Ireland

• Aer Turas^[1]
• Shannon Air^[1]

 Israel

• El Al

 Italy

• Alitalia

 Côte d'Ivoire

• Air Afrique^[1]

 Japan

• Japan Air Lines^[1]

 Kenya,  Uganda,  Tanganyika and  Zanzibar

• East African Airways^{Note 1}

 Lebanon

• Middle East Airlines
• Trans Mediterranean Airways^[1]

 Luxembourg

• Luxair^[1]

 Madagascar

• Air Madagascar^[1]

 Mauritania

• Air Mauritanie^[6]

 Mexico

• Aerovias Guest
• Líneas Aéreas Unidas Mexicanas^{Note 1}

 The Netherlands

• KLM^[1]
• Martin's Air Charter

 Nicaragua

• LANICA (Lineas Aereas de Nicaragua S.A.)

 Niger

• Air Niger^[6]

 Norway

• Braathens SAFE
• Det Norske Luftfartsselskap (DNL)^[1]

 Panama

• Aerovias Internacional Balboa^[3]
• Copa Airlines^{Note 1}

 Paraguay

• Paraguayan Airways Service
• Lloyd Aéreo Paraguayo S.A.

 Peru

• Faucett Perú

 Philippines

• Philippine Air Lines

 South Africa

• SkyClass Aviation^[1]
• Africair^[3]
• Safair^[1]
• South African Airways^[1]
• Trek Airways^[1]

 South Korea

• Korean Air Lines^[1]

 South Vietnam

• Air Vietnam^[7]

 Spain

• Aviaco^[1]
• Iberia^[1]
• Spantax^[1]
• Trans Europa^[1]

 Sweden

• Scandinavian Airlines^[1]
• Svensk Interkontinental Lufttrafik^[1]

 Switzerland

• Balair^[8]

 Syria

• Syrian Airways^[1]

 Thailand

• Thai Airways
• Air Siam^[1]

 United Kingdom

• ACE Freighters^[1]
• Air Charter Limited^[1]
• Channel Airways^[1]
• Dan-Air
• Eagle Airways
• Invicta Airways
• Lloyd International
• Skyways
• Starways^[1]
• Air Links^{Note 1}
• BOAC^{Note 1}
• British Midland^{Note 1}
• Derby Airways^{Note 1}
• Keegan Aviation^{Note 1}
• Overseas Aviation^{Note 1}
• Transglobe Airways^{Note 1}

 United States

• Aero Union
• Air America^[3]
• American Airlines
• American Export Airlines/American Overseas Airlines
• ARAMCO^[1]
• Biegert Aviation
• Berlin Airlift Historical Foundation (http://www.spiritoffreedom.org)
• Capital Airlines
• Chicago and Southern Airlines
• Eastern Airlines
• Matson Airlines
• National Airlines^[1]
• Northwest Airlines^[1]
• Pan American World Airways
• Pacific Southwest Airlines
• Santa Fe Skyways (owned by Santa Fe Railroad)
• Transocean Air Lines
• Trans World Airlines
• United Airlines
• Westair Transport
• Waterman Airlines^[1]
• Western Airlines^[1]
• Zantop^[1]

 Venezuela

• Linea Expressa Bolivar^{Note 1}

• ^1 Canadair North Star operator
• ^2 Ansett-ANA was also an original operator of the Aviation Traders ATL-98 Carvair conversion of the DC-4/C-54

(Douglas C-54 unless specified)

 Argentina

• Argentine Air Force
• Argentine Naval Aviation

 Belgium

• Belgian Air Force - One former R5D1 from 1950–1971, also operated one DC-4.^[1][9]

 Bolivia

• TAM – Transporte Aéreo Militar - one former USAF VC-54D and one C-54G both bought in 1973.^[10]

 Brazil

• Força Aérea Brasileira - Twelve C-54Gs serialled FAB 2400 to FAB 2411, flown by the "1º/2º Grupo de Transporte" between 1960–1968

 Cambodia

• Royal Khmer Aviation (AVRK) - One C-54B used as a VIP transport, flown by the "Transport and Liaison Group" (French: Groupe d'Liaison et Transport – GLT) between 1960-1970.

 Canada

• Royal Canadian Air Force - Canadair North Star

 Chad

• Chadian Air Force - received from France in 1976^[11]

 Colombia

• Colombian Air Force^[1]

 Cuba

• Fuerza Aérea del Ejército de Cuba - Photographic evidence of one registered 614. There are reports of a second one registered 615. Unknown origin.

 Denmark

• Royal Danish Air Force - Six C-54D/Gs, 1959–1977 ^[12]

 Dominican Republic

• Fuerza Aérea Dominicana - Photographic evidence of two aircraft registered 3105 –named 'San Isidro'– and 3106. Unknown origin.

 El Salvador

• Air Force of El Salvador - Canadair North Star

 Ethiopia

• Ethiopian Air Force - One former USAF C-54D from 1966 and one former US DoT C-54G in 1969.^[10]

 France

• French Air Force - One C-54E donated in 1945 and transferred to the Navy in 1960. One C-54A 1961-1975.^[10]
• French Naval Aviation - One C-54E transferred from the Air Force in 1960, destroyed in 1982. One C-54B 1962-1969.^[10]

 Guatemala

• Fuerza Aérea Guatemalteca - One received late 1964 and registered 800. Sold to Honduras as FAH-799 in 1973.

 Honduras

• Honduras Air Force

 Iceland

• Icelandic Coast Guard

 Israel

• Israeli Air Force

 Mexico

• Mexican Air Force - 7 C-54B

Netherlands East Indies

• Royal Netherlands East Indies Army Air Force - four C-54As operated in 1946.^[9]

 Niger

• Niger Air Force - One C-54B 1968-1974.^[13]

 Peru

• Peruvian Air Force - Nine delivered in late 1966.^[14]

 Portugal

• Portuguese Air Force - Four C-54Ds operated from 1952 supplemented in 1961 by four former C-54As that had been modified to DC-4 standard.^[10] In 1965 ten former USAF HC-54Ds were obtained with an additional four as spares.

 Rhodesia

• Royal Rhodesian Air Force - Canadair North Star

 Republic of China

• Chinese Nationalist Air Force - former USAF aircraft 2 × C-54D (one bought in 1965 and one in 1966), and 1 × C-54G (bought in 1968)^[10]

 Saudi Arabia

• Royal Saudi Air Force - one former Saudia C-54A from 1960 and now preserved.^[15]

 South Korea

• Republic of Korea Air Force

 South Africa

• South African Air Force^[1]

 Spain

• Spanish Air Force - Four former C-54Ds given to Spain by the USAF in 1959 were later supplemented by another 13 second-hand aircraft which included C-54, C-54A, C-54B, C-54E, C-54G and 5D-3s.

 Thailand

• Royal Thai Air Force^[1]

 Turkey

• Turkish Air Force - three C-54Ds from 1966-1976.^[9]

 United Kingdom

• Royal Air Force - 10 C-54Ds transferred from USAF under lend-lease in 1945 and returned in 1946.^[10] One special fitted C-54B for the use by Winston Churchill transferred in 1944 and returned in 1945.
  • No. 232 Squadron RAF
  • No. 246 Squadron RAF
  • Metropolitan Communications Squadron

 United States

• United States Army Air Forces
• US Air Force - Douglas C-54
• United States Navy - Douglas R5D
• US Marine Corps - R5D
• US Coast Guard - R5D

 Venezuela

• Venezuelan Air Force - One C-54A 1949-1955.^[13]

 Zimbabwe

• Aviation Traders Carvair

• Berry, Peter; et al. (1967). The Douglas DC-4. Air-Britain (Historians) Ltd.
• Best, Martin S. (Summer 2010). "The Development of Commercial Aviation in China: Part 10B: China National Aviation Corporation 1945–1949". Air-Britain Archive. pp. 63–74. ISSN 0262-4923.
• Blewett, R. Survivors. Coulsden, UK: Aviation Classics, 2007. ISBN 978-0-9530413-4-3.
• Cooper, Tom; Grandolini, Albert; Delalande, Arnaud (2015). Libyan Air Wars, Part 1: 1973-1985. Helion & Company Publishing. ISBN 978-1-909982-39-0.
• Eastwood, Tony; John Roach (1991). Piston Engine Airliner Production List. The Aviation Hobby Shop. ISBN 0-907178-37-5.
• Francillon, René (1979). McDonnell Douglas Aircraft Since 1920: Volume I. London: Putnam. ISBN 0-87021-428-4.
• Pearcy, Arthur. Douglas Propliners: DC-1–DC-7. Shrewsbury, UK: Airlife Publishing, 1995. ISBN 1-85310-261-X.
• Pickler, Ron and Larry Milberry. Canadair: The First 50 Years. Toronto: CANAV Books, 1995. ISBN 0-921022-07-7.
• Milberry, Larry. The Canadair North Star. Toronto: CANAV Books, 1982. ISBN 0-07-549965-7.
• Yenne, Bill (1985). McDonnell Douglas: A Tale of Two Giants. Greenwich, Connecticut: Bison Books. ISBN 0-517-44287-6.
• The PSA History/Oldtimers Page [1]

Wikimedia Commons has media related to C-54 Skymaster.

Wikimedia Commons has media related to Douglas DC-4.

• Canadair DC4M North Star
• Moose Jaw crash at virtualmuseum.ca
• Berlin Airlift Historical Foundation - Operates C-54 "Spirit of Freedom" as flying Berlin Airlift Museum
• Air Force Association page on C-54
• Air Force Museum page on the VC-54C
• Warbird Alley: C-54 page
• Cockpit View of C-54 During Landing/Taxi
• Boeing McDonnell Douglas page on DC-4
• The last passenger certified & built DC-4s in the world
• Vintage Wings of Canada Canadair North Star showing RR Merlin installation
• Loading Santa Fe Skyways DC-4 refrigerated cargo aircraft.
• Santa Fe Skyways reconverted DC-4 refrigerated cargo aircraft.
• Composite photograph of Santa Fe Skyway Inc. DC-4.