Originally Posted by
Cledaybuck
I don't think AA would need anyone except the FAA to approve it to fly domestically. That said, I think Boeing would like to get approval from at least the US, Canada, and Europe simultaneously.
I think this is probably true legally, but given the flak that the FAA received for not grounding the Max as fast as everyone else, I do not think it would be wise for the FAA to approve it again, and airlines to fly it domestically while it is still not certified in the rest of the world. This would even further undermine the FAA's credibility and probably global trust in Boeing too.