Regardless of the booking class, fare type, travel route, or destination, American Airlines allows passengers the perk of a free Flight change within 24 hours of the flight's departure. According to American Airlines' policy on changing flights, the new trip you want to book must have the same origin and destination. Do you intend to use American Airlines' free seat changes? You are allowed to make the adjustments even more than once. The fare difference between the original and revised ticket bookings must be paid by passengers.
On all domestic, international, and long-haul flights, there is no change fee for any of the tickets with the exception of basic economy.
The Basic Economy rate on American Airlines is non-refundable and non-changeable.
If you want to go on a flight that departs before your original trip is planned to, you can fly standby with American Airlines in order to modify your flight.
Read more : Alaska Airlines flight change