Passengers can receive a full refund if they cancel their flight at least 24 hours before departure. American Airlines offers refunds if you cancel your flight at least 3 hours before departure. If you booked a ticket for travel to or from the US, the refund will be credited within a week. Here are some key points of American Airlines’ 24-hour cancellation policy:
https://community.smartsheet.com/profile/policy%20for%20American