The Douglas DC-4 is a four-engine transport family that first flew in production form in 1942 and entered large-scale wartime service as the U.S. Army Air Forces C-54 and U.S. Navy R5D Skymaster. Its long-range, high-capacity airframe served military airlift, presidential transport, postwar passenger routes, and later freight and specialist work. A very small number remain available for cargo and aerial-support operations.
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