Developed during WWII, the DC-4 was commandeered by the U.S. Army Air Forces in 1942 (as the C-54), delaying its use in commercial service until 1946.

After WWII, many many C-54s entered civil service, along with new production DC-4s. One interesting fact of the DC-4's design was that it was the first airliner to introduce a circular section, constant diameter fuselage, which made stretching the basic aircraft relatively simple.

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