UA 3902 then AA 2791 at O'Hare
Rio De Janeiro → Chicago → Los Angeles
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
10:32AA 2791 to Los Angeles leaves the gate
17 h 31 apart on the timetable, overnight
AA 2791 leaves 17 h 31 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.