United Airlines finds loose bolts in Boeing 737 Max 9 jet inspections
United Airlines said "installation issues" relating to door plugs would be "remedied" before the aircraft type would return to service.
Inspections began after a fuselage section fell from an Alaska Airlines 737 Max 9 on Friday.
Alaska Airlines has found "some loose hardware" on some Max 9s.
The Federal Aviation Administration (FAA), which regulates air travel in the US, has grounded 171 planes of the same type.
United said: "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."
The door plug is a piece of fuselage with a window that fills the space where an emergency exit would be in specific configurations.
It was this part of the Alaska Airlines plane which dramatically fell off mid-flight over the US state of Oregon, eventually landing in a teacher's back garden.
The aircraft landed immediately but none of the passengers or crew were seriously injured.
The plane's door plug was recovered from a teacher's backyard in Oregon and was found without the four bolts, the National Transportation Safety Board said on Monday night.
Its chair, Jennifer Homendy, told reporters that it's possible the bolts were missing from the start, but they may have come off in the descent.
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