Production. B-25 "Billy Mitchell" bombers. Partial view of one of North American Aviation's B-25 bomber assembly lines at Inglewood, California. When the planes move out the door, they are ready for painting and flight tests. 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