AC 8547 then CA 3104 at O'Hare
Toronto (YTZ) → Chicago → Shanghai
Timetable, Chicago time
13:20AC 8547 from Toronto (YTZ) at the gate
11:40CA 3104 to Shanghai leaves the gate
22 h 20 apart on the timetable, overnight
CA 3104 leaves 22 h 20 after AC 8547 arrives on the timetable: more than half a day, so not a connection we count.