AA 3554 then CZ 2502 at O'Hare
Jacksonville → Chicago → Shanghai
Timetable, Chicago time
19:52AA 3554 from Jacksonville at the gate
13:55CZ 2502 to Shanghai leaves the gate
18 h 03 apart on the timetable, overnight
CZ 2502 leaves 18 h 03 after AA 3554 arrives on the timetable: more than half a day, so not a connection we count.