Douglas C-54 Skymaster MATS airplane model. The Douglas C-54 Skymaster was a four-engine ,transport aircraft used by the United States Army Air Forces in World War II. Like the C-47 Skytrain, the C-54 Skymaster was derived from a civilian airliner (the Douglas DC-4). C-54s began service with the Army Air Forces in 1942, carrying up to 26 passengers. (Later versions carried up to 50 passengers.) The U.S. Navy also acquired the type, under the designation R5D. The C-54 was one of the most commonly used transports by the U.S. armed forces in World War II. 515 C-54s were manufactured in Santa Monica, CA and 655 were manufactured in Chicago, Illinois.
After World War II, the C-54 continued to serve as the primary airlifter of the new United States Air Force.