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I don’t know about AA but on Vueling (the low-cost carrier of Iberia), I made a booking and didn’t know they don’t do the 24 hour free cancelation like in the US.
I filed a chargeback with AMEX.
It was eventually denied and Vueling banned my email address from booking tickets, so I had to make a new one.
Thankfully I didn’t have any miles in the account.