DL 5805 then DL 2167 at Boston
Philadelphia → Boston → Nashville
Timetable, Boston time
13:55DL 5805 from Philadelphia at the gate
15:55DL 2167 to Nashville leaves the gate
2 h apart on the timetable
The last days
DL 5805 and DL 2167 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.