Has anyone tried this? I'm but a lowly GM (the new FO). It's been in the back of my mind for a while that I should just start banking my miles to AS, especially now that I've gotten the ball rolling with an EK flight that will prime my AS account. Frankly, I am sick of Skymiles and don't care to earn anymore. I like Delta as a domestic airline but the miles are just useless for what I wish to do. I never get upgraded on any of my routes (ex-LAX), although I do take advantage of the free bag (GM, but also Plat DL AmEx), Sky Priority boarding, and preferred seating in Y. I know a lot of *A airlines have 2 fields to place 2 different accounts, so some folks will use one acct with *G for benefits, and another acct to bank miles in. Is it possible to do so with DL?