F9 45 then CZ 2502 at O'Hare
Cancún → Chicago → Shanghai
Timetable, Chicago time
14:45F9 45 from Cancún at the gate
13:55CZ 2502 to Shanghai leaves the gate
23 h 10 apart on the timetable, overnight
CZ 2502 leaves 23 h 10 after F9 45 arrives on the timetable: more than half a day, so not a connection we count.