AA 851 then CZ 2502 at O'Hare
Fort Lauderdale → Chicago → Shanghai
Timetable, Chicago time
09:05AA 851 from Fort Lauderdale at the gate
01:45CZ 2502 to Shanghai leaves the gate
16 h 40 apart on the timetable, overnight
CZ 2502 leaves 16 h 40 after AA 851 arrives on the timetable: more than half a day, so not a connection we count.