The Air Force celebrated the 25th Anniversary of the first flight of the B-2 Spirit bomber on July 17. Here, the first B-2 bomber lines up on the runway July 17, 1989, at the Northrop Grumman production facility in Palmdale, Calif. The first flight was just over two hours long, and ended at Edwards AFB, Calif., where the aircraft underwent further testing on the ground and in the air.