I think that for PVG/SHA facility tours, it might have to or be easiest to go through an airline that's a customer at the facility. The airlines with the most clout would be the best bet, I think that China Eastern has the biggest presence there, they're joining Skyteam next year so a DL contact might work and they currently have codeshares with AA so an AA contact might work. Though working directly with UA, DL, AA might also be possibilities.