NEW : What happened ? U.S. regulators have ordered airlines to stop using their Boeing 787s . Two jets of Boeing 787s have been grounded in Japan after one jet made an emergency landing . The woes come after the delivery of the plane in 2011 , nearly three years behind its production schedule . About 50 aircraft have been delivered ; Boeing has more than 800 unfilled orders from airlines .
NEW : U.S. regulators have ordered airlines to stop using their Boeing 787s . Two jets of Boeing 787s have been grounded in Japan after one jet made an emergency landing . The woes come after the delivery of the plane in 2011 , nearly three years behind its production schedule . About 50 aircraft have been delivered ; Boeing has more than 800 unfilled orders from airlines .