Over the summer I wrote a guide to the mind-numbingly complicated differences between an American Airlines trip credit, travel voucher, flight credit and gift card, including a helpful internal grid that the carrier’s employees use.
American has been replacing paper vouchers with ‘trip credits’ which allow payment towards an adult passenger fare on American and American Airlines codeshares only. These can be used as partial payment towards a ticket (topped off with a credit card) or partially used towards full payment of a ticket, with residual amounts emailed to the passenger. Trip credits can also be used to book yourself an extra seat.