Originally Posted by
cantabdad
Is there any advantage to acting sooner or later on this? What would happen if I took no action at all as of the original departure date/time?
If you have been rescheduled for another flight, and you no-show it, then a paid, non-refundable fare would be forfeit and an award ticket would be subject to a $125 no-show fee. In that case, you should call UA to tell them that the replacement flight doesn't work for. If you haven't, then there is no particular hurry, except that UA's policies seem to be shifting frequently.