UA 3902 then AA 4915 at O'Hare
Rio De Janeiro → Chicago → Lexington
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
15:49AA 4915 to Lexington leaves the gate
22 h 48 apart on the timetable, overnight
AA 4915 leaves 22 h 48 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.