Just following up on this, as I may have noted on another thread, AA overcharged me for LHR taxes by charging me for a stopover there (rather than a transit) during my second pass through London en-route to the US. In order to get the money refunded to my credit card, AA said I could return to Canada for the refund. Given that I live in the U.S. and that this is a bit impractical (particularly considering that the tarrif error was AA's), they said I could go to an AA ticketing desk in the U.S. for the refund to be applied to my credit card. Of course, the AA ticketing desk said this was impossible because the refund is in Canadian Dollars, which means I've now been issued a miscellaneous credit order (MCO) in Canadian dollars, which has to then be sent to the AA Refund Department, which will then apparently send me a check in USD, which I can then cash at my bank. All of which means that sometime in 2009 I should have my money back.