“United is the only other U.S. airline to fly the 737 Max 9 and is the largest operator with 79 in its fleet.”
United found loose bolts on plug doors on at least five Max 9s. Those planes were delivered between November 2022 and September 2023. This isn’t one bad airframe at Alaska. It’s a factory problem, and passengers at 16,000 feet found it before Boeing’s quality control did.