United Airlines announced Monday it found loose bolts during inspections of its Boeing 737 Max 9 fleet following Friday's Alaska Airlines incident in which a door plug blew out mid-flight.

P ORTLAND, Ore. — United Airlines said Monday it found loose bolts and other “installation issues” on a part of some Boeing 737 Max 9 jets that were inspected after a mid-flight blowout on a ...

Bolts in need of "additional tightening ... initial reports from technicians preparing its 737 Max 9 fleet for inspection indicated "some loose hardware was visible on some aircraft".

United said Monday it had "found instances that appear to relate to installation issues in the door plug -- for example, bolts that needed ... to the 737 MAX 9 aircraft involved in Friday's ...

Boeing is asking airlines to inspect its 737 Max planes for a potential loose bolt in the rudder control system, the airplane maker and Federal Aviation Administration confirmed this week.