UA 3902 then AA 6326 at O'Hare
Rio De Janeiro → Chicago → Lexington
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:18AA 6326 to Lexington leaves the gate
15 h 17 apart on the timetable, overnight
AA 6326 leaves 15 h 17 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.