and temperature varies with altitude. With colder temperatures aloft ... Scholl suggested that this could be possible with speeds as fast as Mach 1.3. "Top speed for Boomless Cruise varies ...

The plane, nicknamed "Baby Boom," took off from Mojave Air and Space Port and reached an altitude of 35,290 feet before accelerating to Mach 1.122, the company said. That speed is equivalent to ...

During its eighth test flight, the XB-1 reached a speed of 0.89 Mach (1,090 km/h) and achieved a new maximum altitude of 25,040 feet (7,632 m). The aircraft manufacturer stated that the XB-1 is ...

Boom attributed the high-altitude Mach capability to technology ... 1 test plane during one of its three flight blocks above Mach 1 during its 12th test flight above the Mojave desert Tuesday ...