Just chose my airline today and will see how this goes. For those saying they haven't seen a credit yet:
Please allow 2-4 weeks after the transaction for statement credits to appear on your account.
EDIT: Placed the order on Sun Nov 30 (1 day after choosing airline). I biffed it and did 2 $100 gift cards in one single transaction, which resulted in a $200 purchase on the card and two $100 gift cards in my email inbox.
I am pleased to report that the $200 credit appeared on Dec 5.