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The comments Monday from the National Transportation Safety Board came shortly after Alaska and United Airlines reported separately that they found loose parts in the panels — or door plugs — of some other Boeing 737 Max 9 jets.

“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,” Chicago-based United said.

The findings of investigators and the airlines are ratcheting up pressure on Boeing to address concerns that have grown since the terrifying fuselage blowout Friday night.

Boeing has delivered more than 200 to customers around the world, but 171 of them were grounded by the Federal Aviation Administration on Saturday until the door plugs can be inspected and, if necessary, fixed.

During Alaska Airlines flight 1282 on Friday night, roller guides at the top of one of the plugs broke — for reasons the investigators don’t fully understand yet — allowing the entire panel to swing upward and lose contact with 12 “stop pads” that keep the panel attached to the door frame on the plane, NTSB officials said at a news briefing in Portland.

NTSB Chair Jennifer Homendy said the safety board was investigating whether four bolts that help prevent the panel from sliding up on rollers were missing when the plane took off from Portland or whether they blew off “during the violent, explosive decompression event.”

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