DL 637 then CA 3104 at O'Hare
Seattle (SEA) → Chicago → Shanghai
Timetable, Chicago time
16:47DL 637 from Seattle (SEA) at the gate
11:40CA 3104 to Shanghai leaves the gate
18 h 53 apart on the timetable, overnight
CA 3104 leaves 18 h 53 after DL 637 arrives on the timetable: more than half a day, so not a connection we count.