AA 2779 then K4 221 at O'Hare
Boston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
17:36AA 2779 from Boston at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
16 h 59 apart on the timetable, overnight
K4 221 leaves 16 h 59 after AA 2779 arrives on the timetable: more than half a day, so not a connection we count.