UA 959 then CA 3104 at O'Hare
London → Chicago → Shanghai
Timetable, Chicago time
13:45UA 959 from London at the gate
11:40CA 3104 to Shanghai leaves the gate
21 h 55 apart on the timetable, overnight
CA 3104 leaves 21 h 55 after UA 959 arrives on the timetable: more than half a day, so not a connection we count.