AA 3969 then K4 221 at O'Hare
Hilton Head → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
15:39AA 3969 from Hilton Head at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
18 h 56 apart on the timetable, overnight
K4 221 leaves 18 h 56 after AA 3969 arrives on the timetable: more than half a day, so not a connection we count.