DL 5596 then DL 5613 at Boston
Savannah → Boston → Nashville
Timetable, Boston time
13:59DL 5596 from Savannah at the gate
14:50DL 5613 to Nashville leaves the gate
51 min apart on the timetable
The last days
DL 5596 and DL 5613 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.