United finds loose bolts on at least 5 Boeing 737 MAX 9 aircraft plug doors

United finds 5 faulty planes following Alaska Airlines 737-9 MAX incident. Days after an Alaska Airlines flight had a door plug fly off its fuselage mid-flight, three unnamed United Airlines employees say they’ve discovered loose plugs on five more Boeing 737 MAX 9 aircraft, The Air Current reported. The Boeing 737-9 MAX aircraft are grounded nationwide by the Federal Aviation Administration…