‘Son of Concorde’ jet that could fly from London to NYC in 4 hours breaks sound barrier & hits 713mph during test flight

NASA's $247 million supersonic jet dubbed the "Son of Concorde" has broken the sound barrier for the first time after it zoomed at more than 700mph in a test flight. It's the first step towards a return of super fast flights between London and New York. The jet will zip across the Atlantic in less...