UA 5544 then CV 251 at O'Hare
Cincinnati Northern Kentucky → Chicago → Dallas-Fort Worth
Timetable, Chicago time
05:59UA 5544 from Cincinnati Northern Kentucky at the gate
03:00CV 251 to Dallas-Fort Worth leaves the gate
21 h 01 apart on the timetable, overnight
CV 251 leaves 21 h 01 after UA 5544 arrives on the timetable: more than half a day, so not a connection we count.