Where do you fly out of SFO?
I'd start storing your miles via VX Elevate, personally. You'll *eventually* be able to use them on AS, and it's much easier to earn status on VX than it is on other airlines. Plus, there's not terribly many choices on to whom VX flights can be credited. Other than the 3 Virgin airlines, your choices are limited to Singapore and Emirates for now. AS will be added sometime after the acquisition closes.