UA 563 then K4 221 at O'Hare
Boston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
19:00UA 563 from Boston at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
21 h 20 apart on the timetable, overnight
K4 221 leaves 21 h 20 after UA 563 arrives on the timetable: more than half a day, so not a connection we count.