Originally Posted by
Often1
Remember that E+ is not an upgrade, it's just seat selection. As a Silver, you may select at check-in. The question will be whether what is left of E+ at check-in is better than what you already have. E.g., do you really want an E+ middle over a decent E- middle?
As a Gold, you have an equal shot at E+ as a GS. You may select E+ at booking.
UG's to F are a different issue. Predicting those on a systemwide basis is impossible. Route, day of week, time of day, time of year and so forth will dictate the answer to that. General probabibilities won't help you here.
+1
As another Gold out of ORD, my experience has been about 99% E+ (but not always at booking as I book some very late). If booking 10+ days in advance, it would be hard to imagine E+ not being available at booking. CPU's to F are all over the place, not worth trying to predict.
I'm usually between 70-90 segments per year, so while still a small sample, I'd say it's relatively safe to assume a Gold will get E+.