UA 3902 then AA 3960 at O'Hare
Rio De Janeiro → Chicago → Valparaiso
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:34AA 3960 to Valparaiso leaves the gate
15 h 33 apart on the timetable, overnight
AA 3960 leaves 15 h 33 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.