UA 3549 then CA 1018 at O'Hare
Montréal → Chicago → Shanghai
Timetable, Chicago time
18:46UA 3549 from Montréal at the gate
18:40CA 1018 to Shanghai leaves the gate
23 h 54 apart on the timetable, overnight
CA 1018 leaves 23 h 54 after UA 3549 arrives on the timetable: more than half a day, so not a connection we count.