UA 3902 then AA 4518 at O'Hare
Rio De Janeiro → Chicago → Memphis
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:06AA 4518 to Memphis leaves the gate
15 h 05 apart on the timetable, overnight
AA 4518 leaves 15 h 05 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.