I have before by checking in with the credit card rather than using ticket or ff#
Don't show or mention the ticket for other airline, as they'll be forced to not let you in per written rules. I like the idea of just showing your card... If you're lucky, they'll just wave you in
As an Admiral's Club member - you don't have to have an AA flight, it is its own membership
Yes, of course you can. You paid for the membership!!
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