Boom Supersonic's next-generation XB-1 passenger plane 1 step away from breaking the sound barrier
When you buy through connexion on our site , we may realize an affiliate commission . Here ’s how it works . The unofficial successor to Concorde is one stair nearer to reality after Boom Supersonic marked the 11th successful mental test flight of its XB-1 ultrasonic sales demonstrator aircraft . On Jan. 10 , the XB-1 complete a sustained flight at 728 miles per hour ( 1,172 km / h ) — equivalent to Mach 0....