In 1967, USAF Major “Pete” Knight set a world speed record that remains “unbroken” 68 years later. -Flying the X-15A-2 rocket ...

The X-15 was a rocket-powered research aircraft that pushed human flight to the edge of space and deep into the hypersonic ...

An aircraft capable of hitting 4,520 mph (nearly seven times the speed of sound) is ludicrous to even think about, but the North American X-15 achieved this, defying comparison to any other aircraft ...

"The X-15, which flew from 1959-1970, is still the most advanced research aircraft ever developed and flown, and hangs in a place of honor in the Smithsonian's Air and Space Museum. Its test pilots ...