LAX-PVG: Cleared about 2 months in advance
PVG-LAX: Cleared about 15 hours in advance (I've been checking multiple times a day).
AUS-LAX: was supposed to clear when C opened (part of the same itinerary), I called about 3 days before when I saw C2 and they pushed it through (flight actually went out with 1 vacant seat in F).
LAX-AUS: about 15 hours in advance I noticed that my seat assignment disappeared (says, "select your seat."). There are 2 vacant seats in F (according to the AA website and EF). Just to be safe, I selected another (of course my original is gone, but surprisingly there was another exit row). Perhaps the upgrade went through? Flight looks completely packed (Sunday after Thanksgiving),so I may take a voluntary bump for the right offer, including Monday.