The B-17 Flying Fortress was a legendary American heavy bomber used during World War II. It was one of the most recognizable aircraft of the conflict. The B-17 was designed as a long-range bomber aircraft, capable of carrying large amounts of bombs over considerable distances. Its distinctive feature was the use of four engines, which gave it great power and the ability to operate at high altitudes. The Flying Fortress was extremely durable and well armored, which made it more resistant to enemy attacks. It was also known for its ability to continue flying despite significant damage.