AA 562 then CZ 2502 at O'Hare
Portland (Oregon) → Chicago → Shanghai
Timetable, Chicago time
19:44AA 562 from Portland (Oregon) at the gate
13:55CZ 2502 to Shanghai leaves the gate
18 h 11 apart on the timetable, overnight
CZ 2502 leaves 18 h 11 after AA 562 arrives on the timetable: more than half a day, so not a connection we count.