UA 3902 then UA 5813 at O'Hare
Rio De Janeiro → Chicago → Lexington
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
07:40UA 5813 to Lexington leaves the gate
14 h 39 apart on the timetable, overnight
UA 5813 leaves 14 h 39 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.