The American Airlines change flight policy allows you to adjust your booking online, through customer support, or at the airport. Changes made within 24 hours of booking are free, provided the ticket was purchased at least two days before departure. Keep in mind, fare differences apply if the new flight is more expensive. However, Basic Economy tickets are only eligible for changes within the 24-hour risk-free window and cannot be modified afterward. For non-refundable tickets, changes after 24 hours may involve an American Airlines change flight fee, depending on the type of fare and when the change is requested.