DL 4671 then DL 4683 at Detroit
Harrisburg → Detroit → Grand Rapids
Timetable, Detroit time
13:47DL 4671 from Harrisburg at the gate
18:25DL 4683 to Grand Rapids leaves the gate
4 h 38 apart on the timetable
The last days
DL 4671 and DL 4683 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.