AA 6345 then K4 221 at O'Hare
Lexington → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
11:59AA 6345 from Lexington at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
22 h 36 apart on the timetable, overnight
K4 221 leaves 22 h 36 after AA 6345 arrives on the timetable: more than half a day, so not a connection we count.