The Boeing B-17 ‘Flying Fortress’ was one of the U.S.A.’s main four-engine heavy bombers, operating alongside the B-24 Liberator, and the later B-29 Superfortress, in all theatres of World War 2. It’s a fact that the B-17 almost never saw its place in history and the defeat of Nazi Germany, as the prototype, known as Model 299, crashed due to pilot error during its evaluation in October 1935. Thankfully, the design had shown such promise during the testing phase, in fact exceeding the requirements of the original specification, that further prototypes were ordered despite boeing losing the original contract with the United States Army Air Corps.