Originally Posted by
UA-NYC
Inside T-24 inventory will fluctuate, and you may accidentally get that short leg UG you didn't really want, without getting the long leg.
I'd call in and "un-apply" it to the short leg, so it's only on the long one.
One warning: to "un-apply" a confirmed upgrade you generally need space available in your original booking class. This can be difficult if you purchased a deep-discount economy fare.
-FlyerBeek