UA 3902 then AA 249 at O'Hare
Rio De Janeiro → Chicago → Mexico City
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:45AA 249 to Mexico City leaves the gate
15 h 44 apart on the timetable, overnight
AA 249 leaves 15 h 44 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.