The Boeing model 299 was an amazingly successful aircraft, a total of 12,731 were produced. The very first model was displayed to the public on July 16, 1935. We know the aircraft as the B-17 Flying Fortress.

Improvements to the aircraft were frequent reflecting the needs of the AAF and lessons learned in combat. Design variants include Y1B-17, YB-17A, B-17B, B-17C, B-17D, B-17E, B-17F, and the B-17G. There were a number of post-war modifications and the aircraft saw extensive service in a wide variety of roles.

The 381st Bombardment Group (Heavy) deployed to England with the B-17F. Those aircraft were replaced as the B-17G became available. The group also acquired one B-17E used as a group hack.

To meet production demand, the B-17F was the first model to be produced jointly by Boeing, Lockheed Vega, and Douglas. Despite identical engineering specs, the Fortresses produced by each of these factories had unique differences and modifications.

The biggest visual difference between the F model and the G model for the lay person is the addition of the Bendix Chin Turret. However you should note that at least eighty of the last F models produced were equipped with the turret before leaving the factory. Identification of model type and block number is best determined through the aircraft's serial number.

The last Flying Fortress built, a G model, was finished in August 1945. The Flying Fortress had an amazing history and was truly a testament to the manufacturing capacity and skill of the American worker. The B-17 per unit cost in 1942 was $258,949 and fell to an average cost of $187,742*. This was due to streamlined manufacturing techniques and a reduction in the "man" hours required to assemble the aircraft, only 18,600 hours by 1944**.

* Freeman & Osborne, page 27.
** Ibid.

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