From fortune.com:

The National Transportation Safety Board is asking the public for help in locating the missing door that blew out on Alaska Airlines Flight 1282 as it investigates the incident. The board has classified this as an accident. The aircraft returned to Portland after a rear left part of the fuselage blew out.

The aircraft was carrying 171 passengers and six crew when it reported a pressurization issue on its way to Ontario, California from Portland. The incident took place on a Boeing Max 9, a denser seating layout that has some cabin exit doors deactivated permanently. Few people were seated near the area with the missing door. The Federal Bureau of Investigation is also helping local law enforcement track it down.

The Federal Aviation Administration is grounding some Boeing 737 Max Jets after the blowout as Flight data and cockpit voice recorders from the plane will be sent to a laboratory Sunday for analysis. The NTSB said the investigation will even include a look at the Federal Aviation Administration’s oversight of Boeing Co and the manufacturer’s process for plane making on the affected aircraft type.

The NTSB chair Jennifer Homendy said, we are very fortunate this didn’t end up in something more tragic. She stressed everything would be studied at the early stages, and nothing would be excluded until it could hone in on the causes of interest.



Read more: Public asked to help find Alaska Air 737 Max blowout section