Originally Posted by
knighthawks97
That's what I do as a guide. Then you'll have to guesstimate about how many Elites don't choose the P and E seats.
OP, you'll only be offered to upgrade with miles if your particular booking class is eligible.
Elites get P Seats allocated automatically and I am not sure who would trade them for a non-P/E seats ...
However, this doesn't necessarily help you much, since all ST Elites get P seats, but only a fraction of them is UG eligible. I agree, it gives you a very rough idea how good/bad it will likely be (recently I saw less folks in P seats than empty F seats

), but this is IMO not useful for a guesstimate.