UA 3902 then AA 3051 at O'Hare
Rio De Janeiro → Chicago → Washington National
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
10:55AA 3051 to Washington National leaves the gate
17 h 54 apart on the timetable, overnight
AA 3051 leaves 17 h 54 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.