DL 2123 then DL 5613 at Boston
Savannah → Boston → Nashville
Timetable, Boston time
14:15DL 2123 from Savannah at the gate
14:50DL 5613 to Nashville leaves the gate
35 min apart on the timetable
The last days
DL 2123 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.