AA 2780 then DL 9969 at Boston
Philadelphia → Boston → Atlanta
Timetable, Boston time
10:25AA 2780 from Philadelphia at the gate
16:15DL 9969 to Atlanta leaves the gate
5 h 50 apart on the timetable
The last days
AA 2780 and DL 9969 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.