UA 3902 then AA 1366 at O'Hare
Rio De Janeiro → Chicago → Denver
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
11:54AA 1366 to Denver leaves the gate
18 h 53 apart on the timetable, overnight
AA 1366 leaves 18 h 53 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.