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Which 737 Max? There are several different versions and different configurations? How is "US" defined - N-Registration?

Considering the door problem is only on a specific subset of Boeing 737 Max 9s with the plugged doors. If there's a fleet wide grounding it won't be because of the door problem.

For a fleet wide grounding, there would have to be a faulty component that's shared on all the 737 Max variants and the fault has not been discovered in the 1376 × 737 Max planes they've already delivered even after the intense scrutiny from the MCAS crashes.

certain planes grounded, not whole fleet yet https://www.npr.org/2024/01/06/1223296736/boeing-737-max-9-planes-grounded