Two things explain why you aren’t jetting across the country at the speed of sound: cost, and noise. Forty-eight years after the Concorde made its first flight, supersonic commercial aircraft remain enormously complex and prohibitively expensive. They also generate an ...

Officials with the airline and the Egyptian civil aviation department told Reuters they believed the Airbus A320 had crashed into the sea. Egypt Air said the plane sent an emergency signal – possibly from an emergency beacon attached to the ...