Great it worked out for you! The problem with AA and most other airlines is that they do not enter the fare calculation onto Galileo CRS' whereas they do when its a Sabre CRS. Most airlines will set up the fare into a ticketing format that it is so easy to ticket when needed to do so. And if the taxes are entered incorrectly, the PNR will not close. Hence the airlines need to make sure that the fare calculations are exact and accurate.