UA 3902 then ET 575 at O'Hare
Rio De Janeiro → Chicago → Addis Ababa
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
09:45ET 575 to Addis Ababa leaves the gate
16 h 44 apart on the timetable, overnight
ET 575 leaves 16 h 44 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.