Boeing failed to provide adequate training, guidance and oversight to prevent a mid-air cabin panel blowout of a new 737 MAX 9 flight in January 2024 that spun the planemaker into a major crisis, the National Transportation Safety Board said on Tuesday.

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.

Boeing (NYSE:BA) failed to provide adequate training, guidance and oversight to prevent the midair cabin panel blowout in a new 737 MAX 9 flight in January 2024, the National Transportation Safety Board said Tuesday,