NRT-SEA Offer - 48,800 yen J Award -> F
I booked a 6-segment CO award ticket that included one UA segment from NRT-SEA in business.
Prior to the trip, it said I could upgrade for $995. I knew $995 was likely just for the UA segment. I was curious to see if any other airline segments (NZ, OZ, or NH) would show up but it errored out.
Upon checkin, I was offered C->F for 48,800 (~615 USD) but I didn't take the offer.