UA 3902 then AA 1976 at O'Hare
Rio De Janeiro → Chicago → Puerto Vallarta
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:43AA 1976 to Puerto Vallarta leaves the gate
15 h 42 apart on the timetable, overnight
AA 1976 leaves 15 h 42 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.