The Douglas DC-3, which made air travel popular and airline profits possible, is universally recognized as the greatest airplane of its time. Some would argue that it is the greatest of all time. In addition to the 455 DC-3 commercial transports built for the airlines, 10,174 were produced as C-47 military transports during World War II. For both airline and military use, the DC-3 proved to be tough, flexible, and easy to operate and maintain. Its exploits during the war became the stuff of legend.