DAVIS-MONTHAN AIR FORCE BASE, Ariz. -- An F-16 Fighting Falcon (top), A-10 Thunderbolt II (second from top), F-15C (center), F-15E Strike Eagle (second from bottom) line up for a Heritage Flight formation March 8. The Heritage Flight Conference is held annually, and is the final run through of their performance before the air show season starts. (U.S. Air Force photo/Staff Sgt. Samuel Rogers)