Yes it does If you cancel your booking within 24 hours of making it, American will usually give you a full refund. To get a refund you can call American customer helpline number +1-866-738-0689(OTA) US or +1-84-4838-4902 (OTA) https://forum.netgate.com/topic/194129/customer-service-can-i-cancel-american-airlines-and-get-a-refund