Originally Posted by
nycityny
The upgrade code is supposed to be R. I've booked a couple of upgrades in the past week and they show as R, not ON.
Were your upgrades from business on a 3-cabin to first on a 3-cabin? That is when the ON fare code is supposed to be used, according to a table that smb12 posted. I thought that R is supposed to be used for upgrades from discount econ to first on a 2-cabin. This difference is important, because UA has to have some way to know whether to credit a bonus for the paid business fare, or not.