 The company had produced innovative and important bombers, from the B-17 Flying Fortress and B-29 Superfortress, to the jet-powered B-47 Stratojet and B-52 Stratofortress.The company's civil aviation department lagged far behind Douglas and other competitors, the only noteworthy airliners being the Boeing 314 Clipper and 307 Stratoliner.During 1949 and 1950, Boeing embarked on studies for a new jet transport, realizing that any design must be aimed at both military and civilian markets.