During inspections in response to the Alaska Airlines incident

During inspections in response to the Alaska Airlines incident, United Airlines reports that it discovered loose door plug bolts on a number of its Boeing 737 Max 9 aircraft.

NTSB reports that a missing portion of an Alaska Airlines aircraft has been located in Oregon, while airlines discover loose hardware on Max 9s.

As the airline and United Airlines announced they had discovered loose hardware on several of their Boeing 737 Max 9s, federal investigators looking into the horrific midflight blowout of a portion of the fuselage of an Alaska Airlines aircraft said they had discovered an important piece – a key detail in the investigation of what happened during the plane's "explosive decompression."

Certain Boeing 737 Max 9 aircraft are now grounded nationwide. On Monday, United confirmed it found the loose bolts on an undisclosed number of its 737 Max 9 aircraft as the company is performing FAA-mandated inspections following the Friday incident.

Since we began preliminary inspections on Saturday, we have found instances that appear to relate to installation issues in the door plug –- for example, bolts that needed additional tightening,” United officials said in a statement. The United news was first reported by The Air Current, an aviation industry publication.

Subsequent to their inspections, technicians at Alaska Airlines reported in a statement later on Monday that they had observed "some loose hardware was visible on some aircraft."

According to the statement, Alaska Airlines has not yet begun the formal inspection process of its aircraft since they are awaiting final paperwork from Boeing and the Federal Aviation Administration.

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