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When planes exceed Mach 1 (the speed of sound, or about 767 miles per hour—1,234 kilometers/hour for those using the metric ...

Supersonic planes will burn significantly more fuel than current aircraft, resulting in higher emissions of carbon dioxide, ...

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The XB-1 reached Mach 1.122 when it broke the sound barrier for the first time ... gap left after the Concorde made its final flight in 2003 with its Overture aircraft. "XB-1's supersonic flight ...

Boom Supersonic’s XB-1 jet broke the sound barrier for the first time on ... pilot Tristan “Geppetto” Brandenburg, the XB-1 hit Mach 1.1, invigorating the company’s ambition to design ...

accelerated to Mach 1.122 (652 knots true airspeed or 750 miles per hour) — about 10% faster than the speed of sound — about 12 minutes into the test flight at about 35,000 feet. The fastest ...

On its 12th test flight, the Boom XB-1 prototype broke the sound barrier ... speeds of up to Mach 1.7, similar to service that the Concorde offered before it retired in 2003.

Boom Supersonic's XB-1 is the first civilian aircraft to achieve the feat since the British-French supersonic airliner, which was retired in 2003. The XB-1 broke the sound ... to Mach 1.1 (844mph ...