Air China flight turns around seven hours after takeoff . Passengers and crew foil hijack attempt in China . Carrier cites ` ` threatening incident '' as the reason for return to Beijing . NEW : State ##ment : Initial warning of the incident came from U.S. authorities . The carrier has left again for New York , Air China 's website says .
Air China flight turns around seven hours after takeoff . Carrier cites ` ` threatening incident '' as the reason for return to Beijing . NEW : State ##ment : Initial warning of the incident came from U.S. authorities . The carrier has left again for New York , Air China 's website says .