UA 3902 then AA 4741 at O'Hare
Rio De Janeiro → Chicago → Portland (Maine)
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:30AA 4741 to Portland (Maine) leaves the gate
15 h 29 apart on the timetable, overnight
AA 4741 leaves 15 h 29 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.