1-DL-tix ATL-SEA-PEK-CAN then return CAN-PVG-ATL

1. Yes, you need to go through immigration, do the passport and security check at Guangzhou Airport.
2. Well, if you purchased the interline tickets, then you can catch the flight.
3. You don't need to recheck the luggage at PVG. Generally speaking, the time is a little bit tight. 3-3.5 hours transfer time will be appropriate.

Sorry Stella, was not specific with my questions. 1. On arrival in PEK Term2 layover for 2hr15min, do I go thru immigration and/or customs in PEK airport? 2. If so, is 2hr15min enuf time to do this, then chek in at codeshare CZ counter, go thru passport chek, security, then to depart gate for CAN final destination? 3. On my return trip to ATL from CAN, what security/passport/etc procedures will I have to go thru during my 2hr15min layover in PVG? In all 3 questions, will have only carryon. Thanks for replying to my original questions.