AA 545 then DL 5805 at Philadelphia
Phoenix → Philadelphia → Boston
Timetable, Philadelphia time
05:15AA 545 from Phoenix at the gate
12:25DL 5805 to Boston leaves the gate
7 h 10 apart on the timetable
The last days
AA 545 and DL 5805 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.