AA 4987 then CZ 2502 at O'Hare
Flint → Chicago → Shanghai
Timetable, Chicago time
18:15AA 4987 from Flint at the gate
13:55CZ 2502 to Shanghai leaves the gate
19 h 40 apart on the timetable, overnight
CZ 2502 leaves 19 h 40 after AA 4987 arrives on the timetable: more than half a day, so not a connection we count.