F9 1327 then DL 5401 at Charlotte
Philadelphia → Charlotte → Boston
Timetable, Charlotte time
10:40F9 1327 from Philadelphia at the gate
16:35DL 5401 to Boston leaves the gate
5 h 55 apart on the timetable
The last days
F9 1327 and DL 5401 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.