The Royal Danish Air Force operated Six C-54D/G, from 1959–1977.
The Douglas C-54 Skymaster was a four-engined transport aircraft used by the United States Army Air Forces and British forces in World War II and the Korean War. Besides transport of cargo, it also carried presidents, British heads of government, and military staff. Dozens of variants of the C-54 were employed in a wide variety of non-combat roles such as air-sea rescue, scientific and military research and missile tracking and recovery. During the Berlin Airlift it hauled coal and food supplies to West Berlin. After the Korean War it continued to be used for military and civilian uses by more than thirty countries. This was one of the first aircraft to carry the President of the United States and to assume the callsign:Air Force One.
Very few DC-4s/C-54s remain in service today.The last four passenger DC-4s believed to be operating worldwide are all based in Johannesburg, South Africa and operated by Skyclass Aviation.
The only operator of DC-4s/C-54s in Canada is Buffalo Airways of Yellowknife, Northwest Territories. They operate two in the cargo role, two as water bombers and another 10 registered with Transport Canada.
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