| astronautix.com | Apt Milburn |
After having been launched from a B-50 bomber over the Mojave Desert in California, Capt. Milburn G. Apt (USAF), flying an X-2 rocket-powered plane on its 13th powered flight, set a record speed of 3,377 kph, or Mach 3.196 at 19,977 m. Subsequent loss of control from inertial coupling led to the destruction of the aircraft and the death of the pilot.