Moments before the Philadelphia plane crash, a doorbell camera captured the sound of the Learjet's screaming engines, followed by the blinding fireball. Video provided by Kiara Rios.

On its 12th test flight, the Boom XB-1 prototype broke the sound barrier three times and achieved a top speed of Mach 1.1.

The sound consists of Armstrong saying: “My daughter still goes: ‘Mommy, can we go on our plane again?’ And I’m like, ‘Baby, there is no plane.’” A melancholic power ballad is ...

“There we are!" said Mike Bannister. "XB-1 is supersonic, faster than the speed of sound.” Bannister, a former pilot of the Concorde supersonic plane, made the call as the experimental XB-1 ...