AA 3827 then CZ 2502 at O'Hare
Rochester (ROC) → Chicago → Shanghai
Timetable, Chicago time
06:19AA 3827 from Rochester (ROC) at the gate
01:45CZ 2502 to Shanghai leaves the gate
19 h 26 apart on the timetable, overnight
CZ 2502 leaves 19 h 26 after AA 3827 arrives on the timetable: more than half a day, so not a connection we count.