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 IMAGE: Download Image: Small (0 KB)| Medium (0 KB)| Full Size (1.7 MB) Tags: air force, world war ii Photo By: National Archives VIRIN: 440318-A-ZZ999-001Q.JPG Photo Gallery