AA 6434 then K4 221 at O'Hare
Oklahoma City → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
16:39AA 6434 from Oklahoma City at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
23 h 41 apart on the timetable, overnight
K4 221 leaves 23 h 41 after AA 6434 arrives on the timetable: more than half a day, so not a connection we count.