2-ship Aerial aeroplane Air Racer air-to-air aircraft airplane Aviation blue nose David Presta Fighter formation Keith 'Frosty' Frost military N2269U N5460V North American Aviation AT-6 Texan Yale SNJ Wirraway Harvard North American Aviation P-51D Mustang North American Aviation SNJ-4 P-51D AF 44-72192 P-51D Straw Boss 2 Piston Engine pursuit radial piston engine radial-engine retractable gear single-engine tail-dragger trainer United States Army Air Corps USAAC United States of America warbird World War II WWII