AA 6251 then CK 626 at O'Hare
Milwaukee → Chicago → Shanghai
Timetable, Chicago time
21:00AA 6251 from Milwaukee at the gate
20:01CK 626 to Shanghai leaves the gate
23 h 01 apart on the timetable, overnight
CK 626 leaves 23 h 01 after AA 6251 arrives on the timetable: more than half a day, so not a connection we count.