AA 4518 then K4 221 at O'Hare
Memphis → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
12:40AA 4518 from Memphis at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
21 h 55 apart on the timetable, overnight
K4 221 leaves 21 h 55 after AA 4518 arrives on the timetable: more than half a day, so not a connection we count.