Alaska Airlines has grounded its fleet of 65 Boeing 737 MAX-9 aircraft after an exit panel blew off from the airplane mid-flight late Friday, another black mark for Boeing’s MAX fleet.

No one on board was hurt in the incident, but it raises fresh questions about Boeing’s 737 MAX fleet, which is no stranger to scrutiny. The MAX-9 is a different design than the MAX-8, which was grounded globally for almost two years after two crashes overseas that killed 346 people. Multiple probes into how the MAX-8 was certified heaped blame on both Boeing and the FAA for inadequate oversight.

The flight had to turn back around for Portland International Airport around 5 p.m. local time on Friday, after the crew reported a “pressurization issue,” according to the FAA. Video on social media showed a hole in the fuselage near where the mid-cabin exit........

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