DL 8800 then AA 1339 at Miami
Boston → Miami → Philadelphia
Timetable, Miami time
14:40DL 8800 from Boston at the gate
19:00AA 1339 to Philadelphia leaves the gate
4 h 20 apart on the timetable
The last days
DL 8800 and AA 1339 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.