The Douglas DC-3 is an American fixed-wing propeller-driven aircraft whose speed and range revolutionized air transport in the 1930s and 1940s. Its lasting impact on the airline industry and World War II makes it one of the most significant transport aircraft ever made. Many DC-3s are still used in all parts of the world.
The DC-3 was the result of a marathon phone call from American Airlines CEO Cyrus Smith to Donald Douglas, during which Smith persuaded a reluctant Douglas to design a sleeper aircraft based on the DC-2 to replace American's Curtiss Condor II biplanes. Douglas only agreed to go ahead with development after Smith told him that American would buy 20 aircraft. The new aircraft was engineered by a team led by chief engineer Arthur E. Raymond over the next two years, and the prototype DST (for Douglas Sleeper Transport) first flew on December 17, 1935 (the 32nd anniversary of the Wright Brothers' flight at Kitty Hawk). A version with 21 passenger seats instead of the sleeping berths of the DST was also designed and given the designation DC-3. There was no prototype DC-3, the first DC-3 built followed seven DSTs off the production line and was delivered to American Airlines.