Boom Supersonic's XB-1 made history on Tuesday by becoming the first civil aircraft to break the sound barrier. Why It Matters. Before Tuesday, no civil private manufacturer had passed the sound ...

Boom Supersonic’s XB-1 demonstrator plane just went supersonic in the skies over California’s Mojave Desert, making it the first civil aircraft to break the sound barrier.

The automated boom barrier system is expected to be completed in 15 days since a work order has been issued to a finalised private party by the GCC, said an official with the ICCC.