UA 2618 then CA 3104 at O'Hare
Seattle (SEA) → Chicago → Shanghai
Timetable, Chicago time
13:10UA 2618 from Seattle (SEA) at the gate
11:40CA 3104 to Shanghai leaves the gate
22 h 30 apart on the timetable, overnight
CA 3104 leaves 22 h 30 after UA 2618 arrives on the timetable: more than half a day, so not a connection we count.