AA 3708 then DL 514 at Phoenix
Denver → Phoenix → Boston
Timetable, Phoenix time
08:33AA 3708 from Denver at the gate
13:20DL 514 to Boston leaves the gate
4 h 47 apart on the timetable
The last days
AA 3708 and DL 514 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.