The coupon code seems to work TWICE, both to buy the supercert and then to buy with the supercert the AA gift card. At least the coupon field appears twice. I didn't go through with the transaction--scared that this code might void the MC bonus deal. Any insight? This could be a potential 20% savings (or similar, since saving 10% after a 10% savings doesn't exactly total up to 20%), plus all the miles.