The size of the experimental airspace for today's flight limited how long the jet was able to fly above Mach 1. Boom Supersonic's XB-1 aircraft goes supersonic during a test flight on Jan. 28, 2025.

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 jet reached Mach 0.82 during the test flight, nearing Mach 1 — the speed of sound. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.

The Mach 1 milestone was reached on the 12th test flight of the XB-1. The company says it plans to incorporate what it learns from the XB-1 into a supersonic passenger jet known as Overture that ...