Boeing opens new tab 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.

NTSB Chair Jennifer Homendy said at a board meeting the incident was entirely avoidable because the planemaker should have addressed unauthorized production that was identified in numerous Boeing internal audits, reports and other forums for at least 10 years.