DL 3879 then WN 3075 at Detroit
Cleveland → Detroit → St Louis
Timetable, Detroit time
11:23DL 3879 from Cleveland at the gate
18:20WN 3075 to St Louis leaves the gate
6 h 57 apart on the timetable
The last days
DL 3879 and WN 3075 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.