July 28, 1953

At Edwards AFB, Calif., company pilot William Bridgeman pilots the Douglas X-3 Stiletto to the highest speed this grossly underpowered research aircraft will reach, Mach 1.21-and this only comes after he put the aircraft in a shallow dive. The X-3 was designed to fly at sustained speeds above Mach 2 for longer than 30 minutes at high altitudes.