AA 3312 then K4 221 at O'Hare
Las Vegas → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
15:53AA 3312 from Las Vegas at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
18 h 42 apart on the timetable, overnight
K4 221 leaves 18 h 42 after AA 3312 arrives on the timetable: more than half a day, so not a connection we count.