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
B-17 Flying Fortress units of the United States Army Air Forces the most experienced B-17 units, and their departure from England slowed down the development of the Eighth Air Force’s offensive. Later, two newly trained II Bomber Command groups (2d, 99th) deployed from the United States. The four B-17E groups formed the heavy bomber component of XII Bomber Command (and Northwest African Strategic Air Force). In North Africa Flying Fortresses were used against German and Italian military targets in Algeria and Tunisia, and to attack German shipping in the Mediterranean. Flying Fortresses took part in the bombardment of the Italian stronghold of Pantelleria, the invasion of Sicily and the invasion of