One of a team of 24 had opened a door-plug before, but he was on vacation — leading the NTSB to criticise Boeing's on-the-job training.

The National Transportation Safety Board found Boeing and the FAA responsible for "multiple system failures," leading to Alaska Airlines' door blowing off mid-flight last year near Portland, Oregon.

The NTSB determined that "multiple system failures," including poor practices at Boeing and poor oversight by the FAA, caused the Alaska Airlines flight door plug blowout in January 2024.