DL 3879 then DL 1787 at Detroit
Cleveland → Detroit → Washington
Timetable, Detroit time
11:23DL 3879 from Cleveland at the gate
14:57DL 1787 to Washington leaves the gate
3 h 34 apart on the timetable
The last days
DL 3879 and DL 1787 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.