The Boeing B-17 Flying Fortress was an American heavy bomber that was used extensively during World War II. It was one of the most iconic aircraft of the war, and it played a crucial role in the Allied victory. The B-17 was known for its heavy armament, its long range, and its ability to withstand heavy damage. It was also equipped with a variety of other features, including a pressurized cabin and a tail gunner position. The B-17 was used in all theaters of war, and it was particularly effective in the bombing campaigns over Germany and Japan.