UA 3874 then AA 3363 at O'Hare
Chicago → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
01:21UA 3874 from Chicago at the gate
17:24AA 3363 to Cincinnati Northern Kentucky leaves the gate
16 h 03 apart on the timetable
AA 3363 leaves 16 h 03 after UA 3874 arrives on the timetable: more than half a day, so not a connection we count.