Hello, I am a frequent flyer on UA and AA but this month I had no choice and got booked on Delta (work thing)on one of my trips. Of course, I will sign up for FF program, although I doubt I will fly with them often. Is there a better carrier than Delta to credit my miles to?. They are not running any bonus currently for sign up I think I've heard something about Alaska Airlines, that it's easier to reach premier than on DL or AF. I don't want my miles to go to waste. Any thoughts how to use it in a smart way? Thank you!