Boom Supersonic breaks sound barrier at Mach 1.1 — first civil domestic aircraft to do so
Jan 29, 2025
Key Points
- Boom Supersonic's XB-1 demonstrator becomes the first civil domestically produced aircraft to break the sound barrier at Mach 1.1, vindicating investors who doubled down through regulatory battles and a punishing down round.
- Blake Scholl's decade-plus conviction after leaving Groupon held through brutal setbacks, attracting repeat backers including Airbnb co-founder Joe Gebbia from the YC ecosystem.
- The achievement's significance lies not in the speed itself but in executing supersonic flight through regulatory complexity with a 50-person team, a feat that distinguishes Boom from the French-British Concorde.
Summary
Boom Supersonic's XB-1 demonstrator aircraft broke the sound barrier at Mach 1.1, marking the first civil domestically produced aircraft to achieve supersonic flight. The achievement arrives after more than a decade of regulatory battles and a punishing down round that tested investor conviction.
Blake Scholl, Boom's founder, came to the company from an unlikely origin story: he spent two years as a product manager at Groupon, where he says the experience of working on internet coupons made him yearn to build something he truly loved. Over the past decade-plus, that conviction has held through brutal conditions. The company recently closed a funding round that attracted repeat backers including Joe Gebbia, Airbnb's co-founder, and other investors from the YC ecosystem who doubled down despite the company's history of setbacks.
The regulatory and business story outweighs the engineering one. Mach 1.1 itself is not a novel speed—supersonic flight has existed since the 1970s. The record carries a significant caveat: it's the first civil domestically produced aircraft to break the barrier. The Concorde, which flew supersonically for decades, was a French-British joint venture. That qualifier matters because it reveals where the real achievement lies. In an era of mounting regulatory complexity and capital intensity in hard tech, Boom pushed a 50-person team through the red tape and technical work required to actually execute. Many investors abandoned the company during its worst moments. Those who stayed are now watching a multi-decade bet vindicate itself—and those who left are facing the kind of regret that comes with missing a founder who refused to quit.
The victory also sets up a secondary narrative: Hermeus, a competing startup building military hypersonic aircraft, is racing Boom on a parallel track. Both companies are pursuing adjacent technology for different markets—one commercial, one defense. The two-founder horse race, if told as a dramatic arc, becomes far more compelling than either company's solo story.