- One Boeing mechanic was usually the only one who worked on door plugs, he told NTSB investigators.
- The 35-year veteran was on vacation during critical work on the Alaska Airlines 737 Max.
- A trainee with limited experience filled in, according to NTSB transcripts.
A Boeing mechanic who was usually the only one to work on door plugs was on vacation on two days that later proved critical to the Alaska Airlines blowout.