Looks like they will refund your fees:
If your plans change and you no longer wish to travel, you can cancel your trip anytime on aa.com. We’ll reinstate your miles and refund eligible taxes and fees up to 1 year after the ticket issue date, but you have to cancel your trip before the first flight departs. If you cancel your trip on aa.com, your miles will be reinstated and your refund will be requested automatically in most cases. There is no fee to reinstate your miles.