Originally Posted by AK-business-traveler

I'm flying IAD-MUC-TBS (Tbilisi, Georgia) in August on a B fare. I applied a GPU and the IAD-MUC leg already cleared. Is there any chance that I can use this same GPU to get an upgrade on the MUC-TBS (operated by LH) leg as well? The LH flight is booked with a UA flight number. Or would I have to use another GPU were I to shoot for the upgrade on that last leg?

Thanks in advance for any insights here.