AA 488 then CZ 2502 at O'Hare
Washington National → Chicago → Shanghai
Timetable, Chicago time
22:00AA 488 from Washington National at the gate
13:55CZ 2502 to Shanghai leaves the gate
15 h 55 apart on the timetable, overnight
CZ 2502 leaves 15 h 55 after AA 488 arrives on the timetable: more than half a day, so not a connection we count.