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.
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.
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.
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.
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. ISSN0262-4923.
Blewett, R. Survivors. Coulsden, UK: Aviation Classics, 2007. ISBN978-0-9530413-4-3.
Cooper, Tom; Grandolini, Albert; Delalande, Arnaud (2015). Libyan Air Wars, Part 1: 1973-1985. Helion & Company Publishing. ISBN978-1-909982-39-0.
Eastwood, Tony; John Roach (1991). Piston Engine Airliner Production List. The Aviation Hobby Shop. ISBN0-907178-37-5.
Francillon, René (1979). McDonnell Douglas Aircraft Since 1920: Volume I. London: Putnam. ISBN0-87021-428-4.