I'm new here and I have a question concerning booking United awards flights. I know you can book one way awards flights, but what about the return flight? If no return flight is available through awards mechanism, what do you do? Can you book one way, wait and watch as flights change (I usually book far in advance) and book at a later date? Could I book an awards flight one way and request a miles upgrade on the return and how do you do this? Thanks!