(From top to bottom) An F-16 Fighting Falcon, P-51 Mustang and F-4 Phantom fly in formation over Tucson, Ariz., during the Heritage Flight Conference here March 5, 2010. The annual aerial demonstration training event has been held at D-M since 2001, providing civilian and military pilots the opportunity to practice formation flying in advance of the upcoming air show season. (U.S. Air Force photo by Staff Sgt. Alesia Goosic/Released)