AA 3111 then K4 221 at O'Hare
St Louis → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
13:00AA 3111 from St Louis at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
21 h 35 apart on the timetable, overnight
K4 221 leaves 21 h 35 after AA 3111 arrives on the timetable: more than half a day, so not a connection we count.