Anyone comment on what the actual effect of an RPU is? I'm 1K based out of IAH and my CPU success is about 50%. When I apply an RPU to try and "ensure" an upgrade, my success is about the same. What does an RPU do? Is it an "accelerator" of sorts, adding an additional variable to the prioritization? Does it effectively bump you up a fare class to clear before someone else? Would really like to understand the mechanics of this...