The North American Aviation X-15 was a revolutionary aircraft that forever changed the landscape of aviation and space exploration. Operated by the U.S. Air Force and NASA, the X-15 was part of the ...

This is the first time anyone in the United States has flown a reusable hypersonic rocket plane since the last flight of the X-15, the iconic rocket-powered aircraft that pushed the envelope of ...

On June 8, 1959, NASA's rocket-powered X-15 experimental plane made its first glide flight. The X-15 rocket plane was part of a series of experimental hypersonic aircraft. This flight marked the ...

The X-15 was the first plane to reach the 100,000-foot mark and fly at hypersonic speeds beyond Mach 4, 5, and 6.

The X-15 rocket-plane built by North American Aviation, Inc. is the second approach. It will probably make its first flight to the edge of space in less than a year. Made of stainless steel to ...

Joe Engle, the first astronaut to fly in space on two different winged vehicles, has died at the age of 91. Engle's first flights into space on the X-15 preceded his launching on the space shuttle.

Joe Engle, the last surviving member of the test pilots who skimmed the edge of space on the X-15 rocket plane in the 1960s and who later orbited the Earth on space shuttle missions, died July 10 ...

SpaceX halted the launch of a Falcon 9 rocket on Sunday with 11 seconds to spare after a plane allegedly flew into restricted airspace near the launchpad.