So here's a question that just occurred to me. It's often state that mile instruments upgrade with the same priority as GPUs. That said, since you need a higher W or above fareclass to redeem a GPU doesn't it also mean that GPUs will really upgrade before someone using miles....unless they are at the same fareclass (and guessing that folks redeeming miles pick the lowest fareclass).

Is this logic sound?

Also...looking at my flight it doesn't seem like there on any economy classes about W. Is this a UA bug or something that I can inquire about with an phone agent...or is that just the way the load the system to avoid guys like me trying to jump over W class.