UA 3902 then AA 3111 at O'Hare
Rio De Janeiro → Chicago → St Louis
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
09:30AA 3111 to St Louis leaves the gate
16 h 29 apart on the timetable, overnight
AA 3111 leaves 16 h 29 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.