An F-4 Phantom, P-47 Thunderbolt, F-16 Fighting Falcon and P-51 Mustang fly in a heritage flight formation during the 2006 Defenders of Liberty Airshow at Barksdale Air Force Base, La., on Saturday, May 13, 2006. (U.S. Air Force photo/Master Sgt. Michael A. Kaplan)
A B-17G Flying Fortress and a B-52H Stratofortress fly in a heritage flight formation May 13 during the 2006 Defenders of Liberty Airshow at Barksdale Air Force Base, La. These two aircraft represent 70 years of "fortresses." It was the first time in 50 years that they flew together in formation. (U.S. Air Force photo/Master Sgt. Michael A. Kaplan)
