UA 3902 then AA 482 at O'Hare
Rio De Janeiro → Chicago → Boston
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
12:06AA 482 to Boston leaves the gate
19 h 05 apart on the timetable, overnight
AA 482 leaves 19 h 05 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.