United Airlines says it has found loose bolts on plug doors on multiple 737 Max 9 aircraft during inspections.
It comes as The Federal Aviation Administration (FAA) announced all 171 Boeing 737-9 Max aircraft will remain grounded after a window and chunk of fuselage blew out of one of its Alaska Airlines passenger planes in mid-air.
Industry publication Air Current reported that United found loose bolts on other parts on at least five panels that were being inspected following the accident over the weekend.
The US Federal Aviation Administration (FAA) and Boeing declined to comment.
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