Demonstration supersonic plane will fly at mach 2.2 by the end of 2019
• https://www.nextbigfuture.com, brian wangXB-1 is the first independently developed supersonic jet. It is a one-third scale version of 55 passenger jet. If all goes well $6 billion will be raised to build commercial supersonic passenger jets. Boom Aerospace wants the 55 passenger versions to