Boeing Model 299 from the left
Here we see the Boeing Model 299, the first prototype for the B-17 Flying Fortress. This aircraft made its maiden flight in 1935, giving the United States one of the earliest four engined heavy bombers.
How to cite this article:
Rickard, J (7 April 2019), Boeing Model 299 from the left , http://www.historyofwar.org/Pictures/pictures_boeing_model_299.html