Like many UAers, I am slowly becoming familiar with the CO booking engine. I found it great last year for booking awards (much superior to the UA engine), but now I am perplexed by the process of booking flights when I want to use either my SWU or RU credits (or whatever these are now called). I sign in, then check the "MP Upgrade Award" box and do my search. When I find flights that have upgrade space available, I select those outbound and returns, then move to the final booking screen. However, all that ever shows up here is upgrading with miles, and a huge copay. I can't get the system to show just the SWU/RU fare, or indicate I will be using these rather than miles. (In all the cases I have searched today, I click on the word "fare" and see both R and RN have seats open.) Can someone please explain how to do this type of booking. Or link this to a thread where that discussion has taken place.