NASA's North American X-15

There were three X-15s built.

This one is X-15A-1 (AF Ser. No. 56-6670). This vehicle made 82 powered flights.

First flight June 8, 1959
Introduction September 17, 1959
Retired December 1968

The X-15A-2 (first flown on June 18, 1964) reaching a maximum speed of 4,520 miles per hour (7,274 km/h).