AA 1926 then CZ 2502 at O'Hare
St Louis → Chicago → Shanghai
Timetable, Chicago time
09:00AA 1926 from St Louis at the gate
01:45CZ 2502 to Shanghai leaves the gate
16 h 45 apart on the timetable, overnight
CZ 2502 leaves 16 h 45 after AA 1926 arrives on the timetable: more than half a day, so not a connection we count.