Originally Posted by
Marathon Man
I use Citi MC Gold and Plat for AA mileage earning. ... and therefore create a new account number that can generate a new 100,000 yearly mileage earning cap
If you're using actual spending on the Citi AAdvantage card to earn AAdvantage miles, you're missing the boat. Look at an SPG Amex instead. You earn 1 Starpoint per $1 spent and can transfer chunks of 20k Starpoints to get 25k AAdvantage miles, with no annual mileage earning cap (even without status). You effectively earn 1.25 AAdvantage miles per dollar spent.
The only place were the Citi AAdvantage card (or at least some of them, like the business one) has an advantage is for actual spending at AA, where you earn 2 miles per dollar.