UA 3500 then CA 3104 at O'Hare
Toronto Pearson → Chicago → Shanghai
Timetable, Chicago time
16:44UA 3500 from Toronto Pearson at the gate
11:40CA 3104 to Shanghai leaves the gate
18 h 56 apart on the timetable, overnight
CA 3104 leaves 18 h 56 after UA 3500 arrives on the timetable: more than half a day, so not a connection we count.