AS 324 then CZ 2502 at O'Hare
Portland (Oregon) → Chicago → Shanghai
Timetable, Chicago time
13:09AS 324 from Portland (Oregon) at the gate
01:45CZ 2502 to Shanghai leaves the gate
12 h 36 apart on the timetable, overnight
CZ 2502 leaves 12 h 36 after AS 324 arrives on the timetable: more than half a day, so not a connection we count.