Originally Posted by
halls120
It can’t be all Max 9’s - there are 215 MAX 9’s in service worldwide and the FAA specified it applied to 171 airframes.
Though I can't easily check numbers, the obvious assumption would be that it's all 737-9s with plug doors. 737-9s with actual exit doors there (likely limited to low cost carriers which use an ultra-high-density configuration) wouldn't obviously be subject to this particular issue so may not be subject to the grounding order.