UA 1669 then DL 2167 at Boston
Newark → Boston → Nashville
Timetable, Boston time
12:26UA 1669 from Newark at the gate
15:55DL 2167 to Nashville leaves the gate
3 h 29 apart on the timetable
The last days
UA 1669 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.