“A prototype of a passenger jet designed to succeed the supersonic Concorde broke the sound barrier for the first time on Tuesday above the Mojave Desert in California.

Why it matters: Exceeding Mach 1 speed — 770 miles per hour — is an important milestone in the quest by Boom Supersonic, a Denver-based startup, to resurrect high-speed air travel 22 years after the Concorde retired.”

From Axios.