AA 3547 then CZ 438 at O'Hare
St Louis → Chicago → Shanghai
Timetable, Chicago time
21:51AA 3547 from St Louis at the gate
17:20CZ 438 to Shanghai leaves the gate
19 h 29 apart on the timetable, overnight
CZ 438 leaves 19 h 29 after AA 3547 arrives on the timetable: more than half a day, so not a connection we count.