I know when I used a VISA code I had to show my visa card (and I had to ue it for payment too), so my guess is that if you use an Amex code they'll make you show and/or use your Amex card.
Mine is the "one" card...does not have to be paid off each month.
If you do decide to go the AmEx Discount, you can put in this discount additional coupon code for an extra $25 off. It worked for me.
Good luck.
AD2067JSP (must book by 6/17/07)
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