UA 3660 then DL 2350 at Philadelphia
Washington → Philadelphia → Atlanta
Timetable, Philadelphia time
09:49UA 3660 from Washington at the gate
18:10DL 2350 to Atlanta leaves the gate
8 h 21 apart on the timetable
The last days
UA 3660 and DL 2350 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.