Originally Posted by
Lux Flyer
Unless the ticket has been refared (which requires a reissue), it has an R booking code but the underlying fare remains the same. The upgrade system uses the current booking code in the PNR to determine upgrade priority and the cost of the upgrade (so buying a "sticker upgrade"/premium cabin upsell (PCU) to premium plus in R would then require 30 plus points to upgrade that segment further).
Thank you for confirming.
Indeed, that’s how it ended up working; the PCU made it possible to use 30 PPs to (waitlist) for J upgrade.
Now, I hope that clears. My last three flights (EWR-FRA, among them) were absolutely packed and only one upgrade request (to any premium cabin) cleared.