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Space
Space
Science
Keumars Afifi-Sabet

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

A close-up of a white jet flying through the sky above a snowcapped mountain range.

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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