Production. B-25 "Billy Mitchell" bombers. A North American B-25 medium bomber in the service of the U.S. Army flies over the Inglewood, California, plant in which it was built. 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