Bolts appeared to be missing from the door plug that blew off midflight

NTSB rips Boeing for failing to produce key documents. Boeing has not turned over important records to investigators probing the door plug blowout on a 737 Max earlier this year. Investigators say Boeing has failed to turn over important documents to NTSB investigators. NTSB: Boeing should have turned over key documents to investigators.

The NTSB's preliminary report comes about a month after a door plug blew out of an Alaska Airlines' 737 Max 9. Bolts appeared to be missing from the Boeing 737 Max door plug that blew off midflight, NTSB says. NTSB: Door plug appeared to have been removed from the plane.