XB-1 breaks the sound barrier, reaching Mach 1.122

Boom Supersonic/Overture

Flown by chief test pilot Tristan Brandenburg over Mojave on 28 January 2025, XB-1 climbed to 35,290 feet and accelerated to Mach 1.122, approximately 750 mph. Boom says it was the first time an independently developed, non-government jet broke the sound barrier, and the first civil supersonic jet made in the U.S.

• XB-1 reached Mach 1.122 (approximately 750 mph) at 35,290 feet altitude.
• First supersonic flight by an independently developed, non-government jet.
• First civil supersonic aircraft developed and built in the U.S. to break the sound barrier.
• Demonstrates technology readiness for Boom's Overture airliner program.