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 .
Boeing had made very important bombers , like the propeller B-17 Flying Fortress and B-29 Superfortress and the jet B-47 Stratojet and B-52 Stratofortress .