Hi -- I am not terribly knowledgable about frequent flyer cards, but here goes...I am trying to get to a million miles on American Airlines so I can have the permanent elite status (and hopefully transfer it to other airlines). I have a Citi AAdvantage card that I use for most of my purchases. However, I received an offer in the mail for the Capital One No Hassle Miles Ultra Card, and according to the offer, I get double miles on all purchases, and there are no blackout dates or seat restrictions. Also, there is no annual fee. Sounds pretty good! But what's the catch? I'm also considering getting the Starwood card since I can convert 20k into 25k...that sounds good too. (Is there a catch on that one?). I have the Delta Sky Miles Amex as well since I occasionally fly Delta and I get double miles for certain purchases (so I put those purchases, and only those, on my Delta card). What do you all suggest? Thank you for any assistance and opinions!!!

Peter