We are going to be taking a flight from PVG to ORD on AA288 that leaves 18:00 from T2. We live in Chengdu and need to find a connecting flight. The only problem is we cannot make to it the airport that day until 12:00. How long will we need to transfer from our domestic flight to the international one?

If they are both in T2?
If one is in T1 and one is in T2?

What is the absolute latest you think we could arrive at PVG and still make our connecting flight?