UA 6137 then DL 4139 at Detroit
Washington → Detroit → Cleveland
Timetable, Detroit time
10:18UA 6137 from Washington at the gate
17:56DL 4139 to Cleveland leaves the gate
7 h 38 apart on the timetable
The last days
UA 6137 and DL 4139 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.