AA 3524 then CZ 2502 at O'Hare
Toronto Pearson → Chicago → Shanghai
Timetable, Chicago time
08:39AA 3524 from Toronto Pearson at the gate
20:50CZ 2502 to Shanghai leaves the gate
12 h 11 apart on the timetable
CZ 2502 leaves 12 h 11 after AA 3524 arrives on the timetable: more than half a day, so not a connection we count.