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LiveScience
LiveScience
Keumars Afifi-Sabet

Boom Supersonic's next-generation XB-1 passenger plane 1 step away from breaking the sound barrier

Boom Supersonic
XB-1 aircraft in the sky for its 8th test flight.

The unofficial successor to Concorde is one step closer to reality after Boom Supersonic marked the 11th successful test flight of its XB-1 supersonic demonstrator aircraft.

On Jan. 10, the XB-1 completed a sustained flight at 728 mph (1,172 km/h) — equivalent to Mach 0.95, which is just shy of the speed of sound.

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