Originally Posted by
BLI-Flyer
If you know the AA flight # (not the AS codeshare #), you can go to aa.com and change it online. Otherwise you can call AA or change it when you check in at the airport.
Both online and on checkin machines it will only accect 7-digit AA #s. Maybe I'm missing something, but I've searched and searched for a way to enter an AS # and never found it. yes, you can call, or get the GA to do it - but that is what I mean by "hassle".