AA 547 then K4 221 at O'Hare
Boston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
15:29AA 547 from Boston at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
19 h 06 apart on the timetable, overnight
K4 221 leaves 19 h 06 after AA 547 arrives on the timetable: more than half a day, so not a connection we count.