The National Transportation Safety Board (NTSB) has criticized Boeing for not addressing unauthorized work on its 737 aircraft sooner, a problem that should have been identified years ago. The NTSB has called for a major shakeup at Boeing to resolve ongoing safety issues. The Federal Aviation Administration (FAA) is actively monitoring Boeing's progress with a team of subject matter experts reviewing the company's changes. Despite years of audits revealing multiple instances of unauthorized work, the FAA maintains that it is appropriately overseeing Boeing. The NTSB has suggested that US aviation regulators conduct more surprise audits and inspections at Boeing's factories to better assess the company's manufacturing processes. Meanwhile, Boeing's new CEO is working to restore trust and engage with factory workers. The NTSB made these comments on Wednesday.