IDine actually allows 6 credit cards per FF#
Although officially IDine says you can sign up 3 credit cards, you can actually sign up 6. Now that additional visits are allowed per month, and given that AMEX secodnary cards have different numbers, this might matter if you are focusing on getting miles into a certain account. The credit card name does NOT have to match the name on the IDine account. For example, I can have a credit card in my father's name be listed under MY AA number - and visa versa.
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Ms.DtG