Two U.S. Air Force F-22s from the Raptor Demonstration Team practice an aerobatic maneuver as they fly over the Kentucky Air National Guard Base in Louisville, Ky., on April 14, 2011. The F-22s, based at Langley Air Force Base, Va., will be one of the marquee attractions of this year's Thunder Over Louisville air show, scheduled to take place over the Ohio River in downtown Louisville on April 16. (U.S. Air Force photo by Maj. Dale Greer)