Production. B-25 "Billy Mitchell" bombers. North American Aviation employees at Inglewood, California, assemble parts inside the rear fuselage section of a B-25 bomber. In addition to the battle-tested B-25 "Billy Mitchell" bomber, used in General Doolittle's raid on Tokyo, this plant produces the P-51 "Mustang" fighter plane which was first brought into prominence by the British raid on Dieppe