Originally Posted by meFIRST

Since I used to be a United 1K, let me translate CO for you.

United = Continental
-----------------------
NF = R

NC = Doesn't exist. CO is a 2 class operation only. On intl flights that offer BusinessFirst, NC = R

NY = Doesn't exist. No such benefit at CO. Platinum Elites get expanded BusinessFirst Award inventory allegedly. I have never taken advantage of this.

The only way that I know of to see R inventory is to check " onepass reward upgrade" box.

If you are a Platinum Elite, buying an M fare and hoping for an up, this comes from Z
If you are a regular Elite (Gold or Silver) hoping for an up, this also comes from Z