Alaska Mileage Plan is a good solution for your situation, as you can fly Alaska, Delta, and American to earn miles and consolidate into one account, then redeem on any of them, plus Cathay and Korean Air, which might help with your Asia trips. Mileage Plan is also good with sending you invitations for the survey sites and dining (to earn more miles), and don't forget about the mind-numbing games on Club Bing that can add up to 1/2 a domestic RT.

More info here: http://www.alaskaair.com/as/mileagep...rs_Airline.asp