UA 556 then UA 3916 at Houston
Nashville → Houston → Los Angeles
Timetable, Houston time
08:45UA 556 from Nashville at the gate
12:30UA 3916 to Los Angeles leaves the gate
3 h 45 apart on the timetable
The last days
UA 556 and UA 3916 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.