UA 3902 then UA 4752 at O'Hare
Rio De Janeiro → Chicago → Madison
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
16:40UA 4752 to Madison leaves the gate
23 h 39 apart on the timetable, overnight
UA 4752 leaves 23 h 39 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.