AA 2273 then K4 221 at O'Hare
San Diego → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
14:00AA 2273 from San Diego at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
20 h 35 apart on the timetable, overnight
K4 221 leaves 20 h 35 after AA 2273 arrives on the timetable: more than half a day, so not a connection we count.