UA 3902 then UA 490 at O'Hare
Rio De Janeiro → Chicago → Boise
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:40UA 490 to Boise leaves the gate
15 h 39 apart on the timetable, overnight
UA 490 leaves 15 h 39 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.