Originally Posted by
nycityny
I don't see the words "fee" or "add/collect" anywhere. It's listed under "Additional Charges" and is described as "Premium Cabin Upgrade." It presents this way on two reservations I currently have - 1) a ps EWR-LAX flight and 2) a PHX-EWR flight. The first one ended up booked into United Business (P) class and the second in United First (P) class.
Interesting. That's the "fee" variant; if it were an add/collect it would say something about "difference in fare". In that case, UA intends it to be completely non-refundable; however in practice anything which doesn't re-issue the coupon (SDCs or even exchanges) tend to preserve the upgrade.
I've usually seen those offers book into A (domestic) and ZN (p.s.) but it's completely arbitrary.