My guess is the venmo style payments got eyes on the account and then the amount of foreign spend was the final straw
That would have been my guess as well.
I do not think there is a risk of a AA shutdown, doubt they will even know Citi shut you down
Ok, that would be great.
You could apply for a Barclays AA card if you still want an AA card
Already did.

Figured I'd better apply ASAP, before the cancellations are reported to the credit bureaus and my score tanks...