Originally Posted by Microwave

N00b lounge question—not my first, probably won't be my last. I'll be flying in paid business SEA-SFO-ICN in a couple of months, and will try to upgrade to GF using a friend's GPU. If it clears, would I have access to the GF lounge at SFO, or is class of service based access to GF lounges reserved for those who've paid for GF as opposed to upgrading to it?