IAD-SEA 12.5k award ticket (~$30 in fees/taxes due to close-in ticketing) -> $249 upgrade to F. Not a widebody but I felt like this was a pretty decent offer for a 5-6 hour flight. RT non-award fare was > $1,000.
I had not seen this before, but not only was I offered the buy-up at checkin, when I went to the seat map to see what was open in F I saw that I could mouse-over the open F seats and the popup contained the upgrade offer including price. Concerns about CPUers left out by ToD upgraders aside, it struck me from a web user experience standpoint as a pretty good way to market the upgrades - just click to buy that nicer seat.
Last edited by CarlTheWebmaster; May 6, 2016 at 7:07 am
Reason: Left out a word.