The Chinese airframer has a way to go in designing a supersonic airliner and has yet to fly a low-boom demonstrator similar ...

Despite early hopes, supersonic civilian aircraft like the Concorde proved economically unsustainable: high fuel and maintenance costs, and too much noise compared with subsonic flight.

The throng of spectators, including famed airplane designer Sir Geoffrsey de Havilland, heard the earsplitting shriek before they saw the sleek, bullet-shaped aircraft burst out of the mist and ...