Staring next year, I will most likely be doing a fairly frequent WAS-PDX-WAS commute. I would greatly appreciate any advice. Obviously, comfort is important but so are miles.

My preference would be DCA, but BWI’s fares are attractive and IAD is somewhere in between.

WAS-PDX will be my main back and forth, but there will be a hand full of other domestics, about two to Europe and one or two to Asia each year.

I am currently Silver on Delta (your responses will influence whether I make gold for next year), Gold on US Airways, and Platinum on American. I also have the AmEx Plat card that gives lounge access to CO, NW and DL which also influences my decision.

I open to any suggestions, AA, CO/NW, AS, AS/AA, DL, United/US (BK worries), perhaps America West????