A missing bolt caused a mid-air blowout on a nearly new Boeing jetliner

Wars & Conflicts · Published 15 October 2026 · Updated 25 October 2026 Swipe more like this →

In short: In January 2024, a door plug detached from an Alaska Airlines Boeing 737 MAX 9 shortly after takeoff. The resulting decompression forced an emergency landing in Portland. While all 171 passengers and six crew members survived, investigators discovered a critical manufacturing oversight that triggered a global grounding of the aircraft type.

The incident involved a Boeing 737 MAX 9 that had been in service for only two months. During the flight, a door plug—a panel used to seal an optional emergency exit on less dense cabin configurations—separated from the fuselage at 16,000 feet. This caused an immediate loss of cabin pressure, forcing the pilots to descend rapidly to 10,000 feet to restore breathable air. The NTSB investigation later revealed that four essential bolts, which should have secured the plug, were never reinstalled after being removed at the factory to fix damaged rivets.

The manufacturing process for this specific component involved multiple entities. The plug was produced by Spirit AeroSystems in Malaysia before being shipped to Kansas and eventually to the Boeing factory in Washington. Following the blowout, the NTSB and the FAA launched investigations into Boeing's quality control systems. The FAA mandated immediate inspections for all aircraft featuring these door plugs, leading to findings of loose bolts on other jets operated by carriers like United Airlines and Alaska Airlines. Boeing CEO Dave Calhoun publicly acknowledged the error as a significant quality control lapse.

Beyond the immediate mechanical failure, the event highlighted broader concerns regarding aviation safety protocols. The cockpit voice recorder, which only held two hours of data, was overwritten after the flight because the circuit breaker was not pulled, prompting calls from NTSB Chair Jennifer Homendy to mandate 25-hour recording capacity. Additionally, the incident led to significant financial consequences, with Boeing agreeing to pay hundreds of millions in compensation to airlines and initiating a multi-billion dollar buyback of Spirit AeroSystems to consolidate fuselage production. Criminal investigations by the Department of Justice and the FBI remain ongoing.

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