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Why do you think this? Citi awards one AAdvantage mile per dollar, right?
Yes, but that is one more per dollar than what the AMEX card provides. I do not know what the conversion rate is from AMEX points to other airlines, but AA is not listed on their site.
http://www.amexcardadvisor.com/rewar...rship-rewards/
I will have to look in to the conversion for Marriott, when I use my Marriott branded credit card at a Marriott hotel I receive 5 points per dollar spent.