The B-17 was a low-wing monoplane that combined aerodynamic features of the XB-15 giant bomber, still in the design stage, and the Model 247 transport. The B-17 was the first Boeing military aircraft with a flight deck instead of an open cockpit and was armed with bombs and five .30-caliber machine guns mounted in clear “blisters.” The first B-17s saw combat in 1941, when the British Royal Air Force took delivery of several B-17s for high-altitude missions. As World War II intensified, the bombe

Development of the Boeing Superfortress "very heavy bomber" began late in 1939, and the first XB-29 made its initial flight on Sept. 21, 1942. In a bold wartime gamble, the AAF ordered the plane into quantity production months before that first flight. Among the B-29's new features were pressurized crew compartments and a central fire-control system with remotely controlled gun turrets. Flying combat missions first from India and China and later from the Marianas Islands, the Superfortress repea