so my GE becomes effective today. i have a flight on thursday night. how does the 3 day notice thing work? do the upgrades run at midnight? if so should i see tomorrow morning if it worked or not?

i read a bunch of posts and saw people talking about checking in at the 36 hour mark... do you do this on nwa.com? i thought 24 hours was the rule. is this just for GE/PE's?

i tried using that availability tool but i think i am missing something, i put in all the info and it just listed 4 flights, nothing related to seats. i tried submit and seatmap buttons. the seatmap just said there are 8 seats available but it didnt show the fare classes. NW1916 SDF-DTW on 12/16 at 6:42pm if anyone wants to try it.