UA 3902 then AA 3239 at O'Hare
Rio De Janeiro → Chicago → Pittsburgh
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
12:29AA 3239 to Pittsburgh leaves the gate
19 h 28 apart on the timetable, overnight
AA 3239 leaves 19 h 28 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.