Boeing P-12Boeing P 12 airplane model. The Boeing P 12 was one of the most successful American fighters produced between WW I and WW II. Used by both the Army and Navy (as the F4B), the P 12 was developed from prototypes built by the Boeing Airplane Company at their own expense. It was produced in a basic version and five additional series, B through F. The basic P 12 and the B, C and D series had fabric covered fuselages of bolted aluminum tubing. P 12E and F