UA 3884 then AA 4989 at O'Hare
Melbourne (Florida) → Chicago → Lexington
Timetable, Chicago time
01:06UA 3884 from Melbourne (Florida) at the gate
21:15AA 4989 to Lexington leaves the gate
20 h 09 apart on the timetable
AA 4989 leaves 20 h 09 after UA 3884 arrives on the timetable: more than half a day, so not a connection we count.