The B-17 Flying Fortress was a bomber plane originally crafted by Boeing for it's eventual use in World War II. It gained legendary status as a high-flying bomber that could defend itself in the air as well as taking considerable damage without failing.
While America was it's primary user, countries such as England had full-right to employ the vehicles in their air force ranks. Practically all the major Allied, and Axis powers managed to capture a few of the B-17s and use them for their own purposes.
By it's world-wide retirement in 1968, there had been almost 13,000 built for action. While few working models exist today, it remains a symbol of Allied power and a considerable reason for the eventual victory over Germany.