AA 1253 then K4 221 at O'Hare
San Francisco → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
17:05AA 1253 from San Francisco at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
17 h 30 apart on the timetable, overnight
K4 221 leaves 17 h 30 after AA 1253 arrives on the timetable: more than half a day, so not a connection we count.