UA 3902 then UA 3865 at Houston
Toronto → Houston → Chicago
Timetable, Houston time
08:27UA 3902 from Toronto at the gate
08:00UA 3865 to Chicago leaves the gatealso UA 3903
23 h 33 apart on the timetable, overnight
UA 3865 leaves 23 h 33 after UA 3902 arrives on the timetable: more than half a day, so not a connection we count.