DL 169 then DL 5714 at Boston
Barcelona → Boston → Philadelphia
Timetable, Boston time
13:41DL 169 from Barcelona at the gate
17:25DL 5714 to Philadelphia leaves the gate
3 h 44 apart on the timetable
The last days
DL 169 and DL 5714 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.