Boeing B-17 Flying Fortress NAN10-50.jpg|thumb|B-17 modified for testing of the [[Pratt & Whitney T34|XT-34 turboprop]]. When testing concluded, the aircraft was restored to stock configuration as the "[[Liberty Belle (B-17)|Liberty Belle]]", but was lost in a post-forced-landing fire near [[Oswego, Illinois]] on 13 June 2011.]] [[Category:Boeing aircraft|B-17 Flying Fortress]] [[Category:United States bomber aircraft 1930–1939]] [[Category:Four-engined tractor aircraft]] [[Category:Low-wing aircraft]] [[Category:World War II bombers of the United States]] [[Category:Boeing B-17 Flying Fortress| ]] [[Category:Aircraft first flown in 1935]] Boeing B-17 Flying Fortress The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Competing
RAF Bomber Command aircrew of World War II recognized emergency landing place. Vigilance was always maintained as Luftwaffe night fighters flying as "night intruders" sometimes followed the bombers home and attacked as aircraft came into land. If the conditions were foggy, or particularly poor on their return it was not unusual for aircraft to be diverted to more distant bases which were clear. Arriving back at base crews were promptly ferried to de-briefing where mugs of tea were distributed while each crew was interviewed and a detailed operational report, compiled before a generous bacon and egg breakfast could be claimed. From the outbreak of war RAF Bomber Command