If I book a latitude return trip and upgrade all segments immediately, but later decide I want to change the return (possibly after the first leg is flown but possibly sooner), does anyone know if that flexibility gets messed up because of the confirmed upgrade? I seem to recall an experience where the agent had to cancel and rebook the whole thing when I had something like this come up before, but its been a while. I could just not upgrade the return leg for the time being but since there is R space right now I would rather get that out of the way if it doesn't restrict flexibility later. TIA!