AA 888 then K4 221 at O'Hare
Boston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:59AA 888 from Boston at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
15 h 36 apart on the timetable, overnight
K4 221 leaves 15 h 36 after AA 888 arrives on the timetable: more than half a day, so not a connection we count.