AA 423 then CZ 428 at O'Hare
Washington National → Chicago → Shanghai
Timetable, Chicago time
21:29AA 423 from Washington National at the gate
21:25CZ 428 to Shanghai leaves the gate
23 h 56 apart on the timetable, overnight
CZ 428 leaves 23 h 56 after AA 423 arrives on the timetable: more than half a day, so not a connection we count.