The XB-1 aircraft accelerated to Mach 1.05 within about 11 minutes of taking off, according to Boom Supersonic and live video of the test flight.

Boom Supersonic's XB-1 demonstrator jet became the first U.S.-made civilian supersonic jet to break the sound barrier. The independently funded XB-1 reached a speed of Mach 1.122, or about 750 mph ...

The XB-1 aircraft, a jet independently developed by Boom Supersonic, has broken the sound barrier during a test ... was the crew chief of the helicopter that collided with the passenger plane ...

During the XB-1's historic flight on Tuesday—its 12th test flight overall—the aircraft stayed supersonic for around four minutes before breaking the sound barrier two more times during the ...

On Tuesday, U.S. aerospace startup Boom made history by breaking the sound barrier with its XB-1 jet ... American Airlines collision with Army helicopter is worst U.S. air disaster in years ...

Editor's note: Boom Supersonic successfully broke the sound barrier with the XB-1 today in a major milestone. Read our coverage here. Boom Supersonic plans to break the sound barrier during a test ...

Boom Supersonic achieved Tuesday its goal of breaking the sound barrier on its first attempt with the XB-1 prototype of its Overture aircraft — and then repeated the feat two more times.

An aircraft developed by Boom Supersonic became the first independently funded jet to break the sound barrier this week. The XB-1 aircraft accelerated to Mach 1.05 at about 35,000 feet during a ...