U.S. regulators say some Boeing 737 MAX planes may have faulty parts

The U.S. Federal Aviation Administration on Sunday disclosed a new problem involving Boeing Co's grounded 737 MAX, saying that more than 300 of that troubled plane and the prior generation 737 may contain improperly manufactured parts and that the agency will require these parts to be quickly replaced. The FAA said up to 148 of the part known as a leading-edge slat track that were manufactured by a Boeing supplier are affected, covering 179 MAX and 133 NG aircraft worldwide. The 737 MAX, Chicago-based Boeing's best-selling jet, was grounded globally in March following a fatal Ethiopian Airlines crash after a similar Lion Air disaster in Indonesia in October.