Originally Posted by
exwannabe
Are you flying on MU or DL metal?
Be warned that MU can close boarding early. Far worse, DL can not always issue the MU boarding pass which could really screw things up.
EDIT: I guess DL does not even fly this. So you are on MU. I would not book it for all the above stated reasons.
DL flies LAX-PVG. OP is flying SFO-LAX-PVG. LAX-PVG is even an A350 route currently for DL. So yea it is possible that OP is on DL metal all the way through. DL does not fly SFO-PVG, which would be solely MU.
OP, have back-up options planned ahead (know what leaves around that time) in case you experience any delays, such as rerouting to SFO-SEA-PVG, or SFO-ICN-PVG on KE, or any other routings via SkyTeam hubs.