Not What You Think. Why the "Sound Barrier" Had to be Broken. Posted: June 13, 2025 | Last updated: June 13, 2025. When the US rocket program hit a wall in the 1940s, one particular program ...

A newly released image shows the sound barrier being broken on February 10 as Boom Supersonic’s XB-1, America’s first civil supersonic jet, completed its second supersonic flight.

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Boom Supersonic broke the sound barrier in late January with its XB-1 test jet, paving the way forward in the startup's efforts to build its own supersonic airliner.

Two weeks ago, Boom Supersonic’s XB-1 demonstrator plane made history when it broke the sound barrier over the continental United States, reaching 750 miles per hour (Mach 1.12) near Barstow, ...

Boom Supersonic's XB-1 pathfinder vehicle went out in style Monday (Feb. 10), breaking the sound barrier three times on its 13th and final test flight. Skip to main content.

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