Originally Posted by
nova474
If it's a large schedule change (3+ hours), AA (and practically any airline) will change your flight for free (or cancel without any charge). I have done this personally. Smaller schedule changes are iffy. However, you are asking for a reasonable change, so it doesn't hurt to give them a call here in the US.
Where did you get your distinction between large and small changes as it pertains to AA schedule changes?