AA 2343 then K4 221 at O'Hare
San Diego → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
16:29AA 2343 from San Diego at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
23 h 51 apart on the timetable, overnight
K4 221 leaves 23 h 51 after AA 2343 arrives on the timetable: more than half a day, so not a connection we count.