The United States Air Force Thunderbird prepare to perform at the 2011 Dayton Ohio Air Show.

The Air Force Thunderbirds are lined up and ready to go, July 23, during the 2011 Dayton Airshow at Dayton International Airport, Ohio. The Thunderbirds are the air demonstration squadron of the U.S. Air Force, and based at Nellis AFB in Las Vegas, Nevada. The squadron tours the world, performing thrilling aerobatic flight formations in specially marked F-16 jet aircraft. (USAF photo by Ben Strasser)