AA 2780 then DL 2194 at Boston
Philadelphia → Boston → Nashville
Timetable, Boston time
10:25AA 2780 from Philadelphia at the gate
14:50DL 2194 to Nashville leaves the gate
4 h 25 apart on the timetable
The last days
AA 2780 and DL 2194 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.