Flying Fortresses B-17 “Flying Fortresses” aircraft, of the 91st Bomb Group, 8th Air Force, fly over Germany, March 18, 1944. Many of these aircraft were built by women in the United States. SHARE: Download: Full Size (1.7 MB) Tags: World War II, Air Force Credit: National Archives VIRIN: 440318-A-ZZ999-001Q.JPG Photo Gallery