AA 3524 then Y8 7456 at O'Hare
Toronto Pearson → Chicago → Shanghai
Timetable, Chicago time
08:39AA 3524 from Toronto Pearson at the gate
01:35Y8 7456 to Shanghai leaves the gate
16 h 56 apart on the timetable, overnight
Y8 7456 leaves 16 h 56 after AA 3524 arrives on the timetable: more than half a day, so not a connection we count.