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.

The blowout aboard Alaska Airlines flight 1282 in January 2024 occurred minutes after it took off from Portland, Oregon.

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.