Y4 702 then CA 1018 at O'Hare
Mexico City → Chicago → Shanghai
Timetable, Chicago time
22:13Y4 702 from Mexico City at the gate
18:40CA 1018 to Shanghai leaves the gate
20 h 27 apart on the timetable, overnight
CA 1018 leaves 20 h 27 after Y4 702 arrives on the timetable: more than half a day, so not a connection we count.