UA 4072 then DL 8938 at Philadelphia
Washington → Philadelphia → Detroit
Timetable, Philadelphia time
09:49UA 4072 from Washington at the gate
14:00DL 8938 to Detroit leaves the gate
4 h 11 apart on the timetable
The last days
UA 4072 and DL 8938 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.