Today I made flight reservations through an OTA for DUB-JFK-LAX and LAX-JFK-DUB. Afterwards I was able to see my reservation on the AAdvantage site but when trying to pick my seats and submitting it with a foreign credit card (I'm based in Belgium), I got an error and had to contact AA customer service. The customer service rep told that both the website and the agent could not process a foreign credit card for seat reservations... So what's my best option? Head to BRU airport tomorrow and see if it can be done through the AA reservations & ticketing desk?