UA 3884 then AA 4765 at O'Hare
Melbourne (Florida) → Chicago → Cincinnati Northern Kentucky
Timetable, Chicago time
01:06UA 3884 from Melbourne (Florida) at the gate
22:24AA 4765 to Cincinnati Northern Kentucky leaves the gate
21 h 18 apart on the timetable
AA 4765 leaves 21 h 18 after UA 3884 arrives on the timetable: more than half a day, so not a connection we count.