US-based flight developer Boom Supersonic has begun the final countdown to its first attempt at breaking the sound barrier with its XB-1 demonstrator.  

On January 25, 2025, Boom Supersonic declared the start of a five-day countdown to the historic flight, following 11 tests and 22 months of “rigorous testing”. 

Announcing XB-1’s first supersonic flight, Boom wrote: “3, 2, 1… Boom The countdown is on. XB-1 will break the sound barrier on its next test flight… Things are about to get really, really fast.” 

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