AA 2748 then K4 221 at O'Hare
Las Vegas → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
20:07AA 2748 from Las Vegas at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
14 h 28 apart on the timetable, overnight
K4 221 leaves 14 h 28 after AA 2748 arrives on the timetable: more than half a day, so not a connection we count.