Heritage Flights

An F-16 Fighting Falcon (left), F-15 Eagle (front), F-4 Phantom (right) and an A-10 Thunderbolt II (back) fly in a diamond formation over Tucson, Ariz., Sunday, March 5, 2006, during the 2006 Heritage Conference. The conference combines different U.S. aircraft from more than 60 years of aviation history to ensure certification in performing air shows worldwide. (U.S. Air Force photo/Airman 1st Class Veronica Pierce)

Two F-15 Eagles fly alongside an F-22A Raptor and an A-10 Thunderbolt II over Tucson, Ariz., Sunday, March 5, 2006, during the 2006 Heritage Conference. The conference combines different U.S. aircraft from more than 60 years of aviation history to ensure certification in performing air shows worldwide. (U.S. Air Force photo/Airman 1st Class Veronica Pierce)

World War II-era P-47 Thunderbolt and an A-10 Thunderbolt II fly side by side during the 2006 Heritage Conference. The conference combines different U.S. aircraft from more than 60 years of aviation history to ensure certification in performing air shows worldwide. (U.S. Air Force photo/Airman 1st Class Veronica Pierce)

Two F-15 Eagles fly alongside an F-22A Raptor and an A-10 Thunderbolt II over Tucson, Ariz., Sunday, March 5, 2006, during the 2006 Heritage Conference. The conference combines different U.S. aircraft from more than 60 years of aviation history to ensure certification in performing air shows worldwide. (U.S. Air Force photo/Airman 1st Class Veronica Pierce)