Boeing 377 Stratocruiser (1949-1963) was a large long-range airliner developed from the C-97 Stratofreighter military transport, a derivative of the B-29 Superfortress. The Stratocruiser's first flight was on July 8, 1947. Its design was advanced for its day, its innovative features included two passenger decks and a pressurized cabin, a relatively new feature on transport aircraft. https://en.wikipedia.org/wiki/Boeing_377_Stratocruiser
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