"United Airlines' Boeing 737 Max 9 Investigation Unveils Loose Bolts"

United Airlines discovered loose bolts in its Boeing 737 Max 9 fleet during inspections following the Alaska Airlines incident where a door plug blew out mid-flight. The FAA grounded 171 planes from multiple US carriers for inspections. United has canceled 200 MAX 9 flights and is working to bring the planes back into service. Boeing is in close contact with operators and committed to ensuring safety and quality standards. The NTSB is investigating the Alaska Airlines incident and previous pressurization warning light issues.