Key bolts were missing from Boeing Alaska Airlines plane door, investigation finds

Four key bolts were missing from the door that blew off an Alaska Airlines plane in mid-air, according to a preliminary report from a US regulator. The door plug had been removed to fix rivets damaged in production, the initial report said. The investigation was commenced by the investigative agency National Transportation Safety Board (NTSB) in early January after a mid-flight blowout where the door flew off a Boeing 737 MAX 9 Alaska Airlines aircraft.The door plug is held down by four bolts and secured by ...