UA 3902 then AA 3585 at O'Hare
Rio De Janeiro → Chicago → Key West
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
12:10AA 3585 to Key West leaves the gate
19 h 09 apart on the timetable, overnight
AA 3585 leaves 19 h 09 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.