The U.S. Air Force Thunderbirds at left fly past Launch Pad 39A at NASA's Kennedy Space Center.

The U.S. Air Force Thunderbirds, at left, fly past Launch Pad 39A at NASA's Kennedy Space Center where space shuttle Endeavour (lower right) waits to launch on the STS-123 mission. The aircraft had flown earlier to support the Daytona 500, also celebrating its 50th anniversary, and chose to fly over Kennedy on their way to their next assignment. Endeavour is being prepared for launch on the STS-123 mission targeted for March 11. Photo credit: NASA/Jack Pfaller