UA 654 then K4 221 at O'Hare
Washington National → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
18:29UA 654 from Washington National at the gate
10:35K4 221 to Cincinnati Northern Kentucky leaves the gate
16 h 06 apart on the timetable, overnight
K4 221 leaves 16 h 06 after UA 654 arrives on the timetable: more than half a day, so not a connection we count.