A P-38 Lightning, two F-86 Sabres and a F-22 Raptor fly in formation together during the 2015 Heritage Flight Training and Certification Course at Davis-Monthan Air Force Base, Ariz., Feb. 28, 2015. During the course, aircrews practiced ground and flight training to enable civilian pilots of historic military aircraft and U.S. Air Force pilots of current fighter aircraft to fly safely in formations together. (U.S. Air Force photo by Staff Sgt. Courtney Richardson/Released)