Originally Posted by
gnaget
I was going to say no regarding UA, but did a quick search. R is their new discount bucket for Premium Plus (their new premium economy product) and they have upgrades in RN for this. If you are talking about pre-CO merger then I suddenly have a vague recollection that they used R. But UA is not part of the Amadeus family either.
If my theory is correct, then it is surprising since SAS would normally not make this available in the public domain.
UA don't for sure anymore, now you can just look at the number of open J seats, and hope the count is equal or higher to your number on the upgrade list. But as long as you are using Plus Points (as it is now) you know any available J seat will be used to clear the waitlist. So all in all slightly different concept.