UA 3902 then AA 3657 at O'Hare
Rio De Janeiro → Chicago → Key West
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
07:30AA 3657 to Key West leaves the gate
14 h 29 apart on the timetable, overnight
AA 3657 leaves 14 h 29 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.