Could you possibly have a UPromise (college savings) account that has your credit card listed? Upromise now has a Rewards Network dining component that they automatically put you into if you give them a credit card. You can opt out of the Dining savings if the card is already listed on another Rewards Network dining program. You could then add the card to AA's IDINE program.

(Upromise says they give you 4-8% cash back, but since I don't have any cards listed in their dining program, I can't see what savings amount would be for a particular restaurant. Does anyone have any experience with UPromise Dining? Do they have bonus promotions?)