One of the three coolest aircraft ever, the Douglas DC-3 rolled out on December 17, 1935 and is still flying today. Whenever you think of someone taking a plane somewhere in the 1930s and 1940s, you're probably picturing a DC-3. The kind of thing Indiana Jones travels in, with a Nazi spy sitting a few seats back glaring at him over a newspaper. Variations: the C-47, R4D, and the Dakota.