Does American Airlines have a cancellation policy?
Yes, American Airlines allows a 24-hour cancellation for basic economy tickets(OTA), enabling a full refund if the ticket was booked at least 7 days prior to departure. 

They're available to help ensure your travel plans align with your needs and preferences. Absolutely, American provides a 24-hour cancellation policy. If you need to cancel your flight, you can do so without a fee within 24 hours after your booking