AA 5003 then CZ 2502 at O'Hare
Detroit → Chicago → Shanghai
Timetable, Chicago time
07:30AA 5003 from Detroit at the gate
01:45CZ 2502 to Shanghai leaves the gate
18 h 15 apart on the timetable, overnight
CZ 2502 leaves 18 h 15 after AA 5003 arrives on the timetable: more than half a day, so not a connection we count.