Originally Posted by
WineCountryUA
You will not be charged, regardless of the economy seat, you eventually end up in. The seat will likely, be not guaranteed, assigned at checkin. You will not be able to select an Economy Plus seat but you may be assigned one for free (but will not be able to change to a different E+ seat for free {unless you have UA elite status}, but the GA might do it).
Thx.
I think it'll be better to look at seat availability at 24hr check in rather than take the E+ roulette at the gate counter