My experience is exactly the opposite. I bought, via the internet tool, a rtw ex-Jordan, and paid with a US credit card while I was physically in Brazil. When I wanted to change the routing AA refused. The rate desk insisted, citing the US credit card address, I would have to pay up to the ex-USA rate (ex-Brazil would have been the same) or they would not make any changes. This attitude was noted in the record and I was never able to change the routing. I know of other people who have had better luck on this score, but that is my concrete experience. I think this was in 2008. At any rate, it was at about the time that the on-line tool was first set up.