The DC-3 was engineered by a team led by chief engineer Arthur E. Raymond and first flew on December 17, 1935 (the 32nd. anniversary of the Wright Brothers flight at Kitty Hawk). The plane was the result of a marathon phone call from American Airlines CEO C.R. Smith demanding improvements in the design of the DC-2. The amenities of the DC-3 (including sleeping berths on early models and an in-flight kitchen) popularized air travel in the United States. With just one refuelling stop, transcontinental flights across America became possible. Before the DC-3, such a trip would entail short hops in commuter aircraft during the day coupled with train travel overnight.
http://en.wikipedia.org/wiki/Douglas_DC-3
