Traveling at the speed of sound may actually be on the horizon. NASA’s supersonic aircraft, dubbed “son of Concorde” after its predecessor, successfully broke the sound barrier for the first time. The experimental X-59 aircraft completed an 81-minute test flight on Friday, 5 June, reaching a speed of nearly 713mph while flying at an altitude of 43,400ft, according to the space agency. The jet completed an 81-minute test flight earlier this month over California’s Edwards Air Force Base,