DL 3990 then DL 5855 at Detroit
Louisville → Detroit → Grand Rapids
Timetable, Detroit time
12:04DL 3990 from Louisville at the gate
14:57DL 5855 to Grand Rapids leaves the gate
2 h 53 apart on the timetable
The last days
DL 3990 and DL 5855 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.