I don't think anybody has posted this yet because I checked in the FAQ's and didn't see it mentioned. In case anybody wants to know, I think I've found a way to query the R inventory through United's site. You have to have a Mileage Plus account so sign up if you don't have one. Once you do switch the view into expert mode. To do that go to My Profile link at the top of the page, then click on my travel information, scroll towards the bottom and you will see Display Preferences. Switch availability to an expert and save. You may have to log out, after all it is .bomb. Then go do an award search for the flight you want. You probably have to do it segment by segment. Once the search results come up click on Star alliance awards. This will then display a mix of UA, CO and US flights. The only trick is that award inventory for economy or BE/BF has to be available so the flight you want actually shows. If your flight does show, hover your mouse over flight details and all inventory buckets will show. Remember you have to be logged in to United.com for the buckets to show. Hope people find it useful.