Thanks for the response!
Forgot to mention four of us include 2 children age 6 and 7 so 2 adult and 2 children.
I checked all possible flights from HKG/CAN/SZX-PEK-PVG they cost about $500/person
I am leaning to use miles :
China Southern = HKG-PEK(stop)-PVG round trip for 30K/35K skypesos
China Eastern = HKG-PVG(STOP)-PEK round trip for 30K/35K skypesos
I cant use AA miles on CX/KA to do both PEK and PVG for less than 30k, they charge 15k one way and they dont have PEK-PVG
any better ideas?