AA 3484 then K4 221 at O'Hare
St Louis → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
19:05AA 3484 from St Louis at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
15 h 30 apart on the timetable, overnight
K4 221 leaves 15 h 30 after AA 3484 arrives on the timetable: more than half a day, so not a connection we count.