DL 5334 then DL 1826 at Detroit
Philadelphia → Detroit → Washington
Timetable, Detroit time
14:04DL 5334 from Philadelphia at the gate
14:55DL 1826 to Washington leaves the gate
51 min apart on the timetable
The last days
DL 5334 and DL 1826 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.