AA 2590 then K4 221 at O'Hare
Santa Ana → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
15:03AA 2590 from Santa Ana at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
19 h 32 apart on the timetable, overnight
K4 221 leaves 19 h 32 after AA 2590 arrives on the timetable: more than half a day, so not a connection we count.