UA 4517 then UA 3306 at Charlotte
Washington → Charlotte → Rochester
Timetable, Charlotte time
14:20UA 4517 from Washington at the gate
18:15UA 3306 to Rochester leaves the gate
3 h 55 apart on the timetable
The last days
UA 4517 and UA 3306 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.