I had 2 successful UGs from W to C on IAD-EZE and 1 ORD-EZE and they always
were a cinch.
Cleared about weeks prior to the flight. Load in C was very light, F even lighter,
Y packed on all hops.
The whole E+ cabin on the 763s are great but the exit row 16 is particularly roomy.
I find the windows in 16 very draughty though and you need a thick blanket
not to freeze to death.
Row 15 gives you a lot of privacy.