AA 3083 then DL 1889 at Atlanta
Philadelphia → Atlanta → Boston
Timetable, Atlanta time
13:24AA 3083 from Philadelphia at the gate
19:20DL 1889 to Boston leaves the gate
5 h 56 apart on the timetable
The last days
AA 3083 and DL 1889 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.