It's funny you brought that up. There was another thread two weeks ago talking about being offered international upgrades at the gate for cash. I swore I had done this recently and I wanted to dig in to my receipts because if it was thermal paper, it was at the gate at CVG, and if it was the thicker stock, it meant I did it at the ticket counter. CVG and DAY ticket counters are the only two places I've still be getting the card stock (not from the kiosk, but the counter).

For what it's worth, I can't go look now because I have guests sleeping in that room. I never did follow up on that other thread.