UA 3902 then AA 3356 at O'Hare
Rio De Janeiro → Chicago → Memphis
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
11:55AA 3356 to Memphis leaves the gate
18 h 54 apart on the timetable, overnight
AA 3356 leaves 18 h 54 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.