P51 D Mustang "Gunfighter". Gunfighter is one of the world’s most famous P-51 Mustangs, having appeared on the airshow circuit and providing rides for over 35 years. The aircraft is a P-51 "D" model, serial number 44-73264. Of the approximately 15,000 P-51s produced in WWII, over 8,000 were “D” models. Today, only about 150 airworthy examples of Mustangs exist world-wide in museums, flying or under restoration.