Odd GGU experience: I have a friend on a red-eye from SFO-JKF that is four days. I offered to see if there was U space for a GGU and to my surprise there were 5 this close in. So I applied it, and then went to check the route in ExpertFlyer and it went down to U0. Seat map shows same open seats, so I don't think I kicked the Professor in the pants to upgrade others. (It was T-80 hours when I applied it.) Still a fair bit of U space on the next flight too for Tuesday night.