UA 3902 then UA 795 at O'Hare
Rio De Janeiro → Chicago → Vancouver
Timetable, Chicago time
17:01UA 3902 from Rio De Janeiro at the gate
08:49UA 795 to Vancouver leaves the gate
15 h 48 apart on the timetable, overnight
UA 795 leaves 15 h 48 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.