UA 3902 then AA 2124 at O'Hare
Rio De Janeiro → Chicago → Los Angeles
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:52AA 2124 to Los Angeles leaves the gate
15 h 51 apart on the timetable, overnight
AA 2124 leaves 15 h 51 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.