I live in Ilinois and travel every other month to SJU. I'm currently PLT with AA, and AA is my airline of choice overall. With UA I only have 35k miles, and 25k miles with CO. Forget about DL, the conection at ATL is not beneficial. Anyhow, I also have the Citibank AAdvantage Mastercard as my primary card. For auto rentals I moslty use National, but I have not been able to move up in their elite ladder, maybe this year. Am I maximizing my mileage returns? or am i missing something. Please advise, I forgot to mention that on my car rentals, I prefer to have rental credits as opposed to miles. I do not have much with hotel rentals as I do not use them that much.

Anything else to help maximize my mileage will be appretiated.