American Airlines offers several options for ticket changes, but the policies depend on the type of fare purchased. For most main cabin and higher fares, American Airlines does not charge a change fee on domestic, short-haul international, and select long-haul international flights. However, passengers are responsible for paying any fare difference between the original ticket and the new one. Basic Economy tickets generally do not allow changes unless exceptions apply, such as under certain international travel regulations. For award tickets booked using AAdvantage miles, changes are typically allowed without a fee, though the fare difference may apply if there is a change in the award ticket redemption level. In addition, travelers can modify tickets by contacting American Airlines directly via their website, mobile app, or customer service. Some tickets purchased through third-party vendors may have different rules, so it's essential to check the specific terms of the fare. If a passenger wishes to change a flight within 24 hours of booking, American Airlines allows this for free under their 24-hour flexible booking policy. Lastly, American Airlines encourages travelers to manage their reservations and review ticket policies before making changes to avoid unexpected fees or issues.