From this winter schedule (begins later this month), AA changes some of 777 flights out of LAX:

NRT-LAX 505pm-1010am
deferred by 30m or 1h30m depending on season, identical departure time with JAL flight

LAX-PVG 1010am-410pm+1
PVG-LAX 620pm-155pm
moved 4-5 hours earlier than the current schedule

LAX-GRU 740pm-145pm+1
moved 3 hours earlier than the current one (didn't know it was modified long ago)

And MIA-LAX 777 flight is moved from 920am flight to 7am flight. That's because AA now needs one 777 for NRT flight (departing 1130am).

Overall positive move.