UA 3902 then AA 4384 at O'Hare
Rio De Janeiro → Chicago → Pensacola
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
11:32AA 4384 to Pensacola leaves the gate
18 h 31 apart on the timetable, overnight
AA 4384 leaves 18 h 31 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.