AA 3409 then CA 8414 at O'Hare
St Louis → Chicago → Shanghai
Timetable, Chicago time
07:34AA 3409 from St Louis at the gate
05:40CA 8414 to Shanghai leaves the gate
22 h 06 apart on the timetable, overnight
CA 8414 leaves 22 h 06 after AA 3409 arrives on the timetable: more than half a day, so not a connection we count.