score:6
This depends whether you are checked in all the way through Busan in New York. This is NOT always the case; I was flying on China Eastern a few months ago KUL-PVG-SFO and I was NOT checked in all the way through, and even had to re-check my bag.
However this does not matter, since the immigration in PVG will let you through when you present the second ticket departing from China; you will get a one day temporary entry stamp, and can even visit the city. You do not need Chinese visa for that in this airport (and a few others), but you do have to be a national of one of (many) countries which are allowed to do so.
Now, to your questions:
"Joint inspection process": in China when you connect from international to international flight, you still go through a kind-of-immigration when they scan and register your passport. The way it looks at their computer screen it seems like they register you in the computer as arrived, and then immediately register you as departed. Nothing is stamped in your passport. I've been through this process many times at Guangzhou airport. PVG has international transfer counters too, so I assume the procedure is the same.
Side note: in Guangzhou this is very slow and annoying process if you arrive early morning, as only couple of booths are staffed. Then it is faster to go through "real" immigration, and then come in.
No app, as far as I know, but it is not needed either. From my experience the immigration there was always pretty quick, with many lines open, and they're quite efficient there. Longest I had to wait was 15 minutes.
No idea about site, and your 2 hour layover should suffice.
Upvote:1
They've been talking about airside international transfers at PVG for some time, but if they don't, you really don't need to worry with one ticket and one airline- it's pretty much their problem.
Just don't dally unnecessarily and make sure you know where your bags are checked through to when you check in in NY. If they're marked PUS or PVG.. so you know if you have to retrieve them.