UA 787 then K4 221 at O'Hare
Houston → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
16:29UA 787 from Houston at the gate
16:20K4 221 to Cincinnati Northern Kentucky leaves the gate
23 h 51 apart on the timetable, overnight
K4 221 leaves 23 h 51 after UA 787 arrives on the timetable: more than half a day, so not a connection we count.