North American Aviation P-51D-5-NA 44-13366 on a test flight near the North American plant at Inglewood, California. This airplane is similar to the Mustang flown by Mrs. Silver, 26 October 1944. 44-13366, was an often-photographed Mustang. It was flown by 1st Lieutenant Ward H. Douglass, assigned to the 358th Fighter Squadron, 355th Fighter Group, at Station 122, RAF Steeple Morden, England. It carried the identification letters YF K. (LIFE Magazine)