AA 215 then K4 221 at O'Hare
Cancún → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
17:40AA 215 from Cancún at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
16 h 55 apart on the timetable, overnight
K4 221 leaves 16 h 55 after AA 215 arrives on the timetable: more than half a day, so not a connection we count.