F9 45 then K4 221 at O'Hare
Cancún → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
14:45F9 45 from Cancún at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
19 h 50 apart on the timetable, overnight
K4 221 leaves 19 h 50 after F9 45 arrives on the timetable: more than half a day, so not a connection we count.