UA 3902 then UA 3770 at Houston
Toronto → Houston → New Orleans
Timetable, Houston time
08:27UA 3902 from Toronto at the gate
12:45UA 3770 to New Orleans leaves the gate
4 h 18 apart on the timetable
The last days
UA 3902 and UA 3770 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.