The Globe and Mail reports in its Tuesday edition that United Airlines has found loose bolts and other "installation issues" on a part of some Boeing 737 Max 9 jets that were inspected after a blowout on a similar Alaska Airlines jet on Friday. An Associated Press dispatch to The Globe says that the inspections are focused on plugs used to seal an area set aside for extra emergency doors that are not required on United and Alaska Max 9s. "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 Federal Aviation Administration grounded all Max 9s operated by Alaska and United and some flown by foreign airlines after a terrifying flight on Friday night. The Boeing jetliner that suffered an inflight blowout over Oregon was not being used for flights to Hawaii after a warning light that could have indicated a pressurization problem lit up on three different flights. Alaska Airlines decided to restrict the aircraft from long flights over water so the plane "could return very quickly to an airport" if the warning light reappeared, U.S. regulators said Sunday.