"Boeing 737 Max 9 Planes Face Safety Concerns After Alaska Airlines Door Blowout"

United Airlines found loose bolts on the door plugs of several of its grounded 737 Max 9 planes following the Alaska Airlines mid-air incident where a door plug blew out. The FAA has grounded all Boeing 737 Max 9s involved in the incident until they are deemed safe. United Airlines is working to return the affected aircraft to service but expects significant cancellations, while Boeing is committed to ensuring safety and quality standards.