Boeing’s failure to provide adequate training to manufacturing staff was a driving factor in a near-catastrophic Alaska Airlines mid-flight blowout,

After a year and half of investigating, the top U.S. aviation investigator formally determined that Boeing and its chief regulator were to blame for the Alaska Airlines blowout.

The plane was at 16,000 feet when a door plug in the plane’s cabin flew off, creating a vacuum that pulled items from the plane.