Tuesday’s XB-1 flight marks the first human-piloted civil supersonic flight since Concorde’s retirement more than 20 years ...

One prototype now resides at the National Museum of the U.S. Air Force in Dayton, Ohio. XB-70 Valkyrie ... the 1950s as an option to replace the B-52. Developers wanted a delta-wing jet plane ...

After years of testing and refinement, a pilot flying the aerospace company’s XB-1 scale prototype finally broke the sound barrier during a livestream event—not once, not twice, but three times.

Designed to replace the B-52, the Valkyrie boasted speeds ... leading to the destruction of one prototype. -The sole remaining XB-70 was retired in 1969, solidifying its legendary status in ...