UA 3902 then AA 2809 at O'Hare
Rio De Janeiro → Chicago → Miami
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
10:14AA 2809 to Miami leaves the gate
17 h 13 apart on the timetable, overnight
AA 2809 leaves 17 h 13 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.