It has been reported on FlyerTalk the 10% off American Airlines Giftcards available at selected Costco will end once existing supplies are exhausted. This means Costco will not restock them again.
If you have upcoming travel, go get them before they all disappear. This is one of the best discounts out there and it will be disappointing when these go away. See our previous post for a list of Costco’s that had American Airlines Giftcards availability to see if they still have them, and if they do, go pick them up before they are gone!