Summary
- The X-15 hypersonic rocket-powered aircraft, built by North American Aviation, conducted over 199 flights between 1959 and 1968.
- A joint project of NASA, the U.S. Air Force, and the U.S. Navy, the X-15 contributed valuable knowledge for future programs like the space shuttle.
- Pilots like A. Scott Crossfield, Joe Walker, Neil Armstrong, and others flew the X-15 to extreme speeds and altitudes.