Boom Supersonic’s XB-1 creates a sonic boom inaudible from the ground below when flying at the exact right speed and altitude.

The test flight might have come "years later than expected and lasted just 12 minutes", said The European, but it could herald the return of supersonic travel, halving some commer

Aerospace startup Boom says they've proven quiet supersonic flight is possible with their passenger airplanes after a successful second test flight.