AA 4504 then CZ 438 at O'Hare
Dayton → Chicago → Shanghai
Timetable, Chicago time
07:23AA 4504 from Dayton at the gate
01:45CZ 438 to Shanghai leaves the gate
18 h 22 apart on the timetable, overnight
CZ 438 leaves 18 h 22 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.