The process for refund depends on when you made your American Airlines reservation and when the flight was cancelled. You will automatically be refunded if you cancel your reservation less than 24 hours after purchasing a ticket and 48 hours prior to the departure of the flight. The carrier will subtract service charges for using the reservations phone system and nonrefundable taxes from the amount of your refund.
There are a few steps you must take in order to get a refund from the airline if the 24-hour deadline has gone. You can make a refund request online instead of waiting in long queues by calling American Airlines reservations, which will save you time.