AA 6291 then K4 221 at O'Hare
Oklahoma City → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
15:30AA 6291 from Oklahoma City at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
19 h 05 apart on the timetable, overnight
K4 221 leaves 19 h 05 after AA 6291 arrives on the timetable: more than half a day, so not a connection we count.