As per American Airlines flight change policy, we allow same-day confirmed changes on selected flights for a fee, with a few exceptions. If you plan to modify your trip, you will have to pay any difference in the price tag price after you rebook your trip. You are allowed to change your origin and destination cities. There is no modification fee on US operated flights, although the difference in fares still applies. At American Airlines, you'll find great travel deals, discount flight tickets, and Advantage bonus airline miles offers. Ally | There is no charge to change the American Airlines rewards flight, so you will need to pay any miles due for your new flight. To make modifications, visit the American Airlines official website and click on the Manage Bookings tab or decide on their reservation center.