AA 2378 then AA 1339 at Miami
New York LaGuardia → Miami → Philadelphia
Timetable, Miami time
14:10AA 2378 from New York LaGuardia at the gate
19:00AA 1339 to Philadelphia leaves the gate
4 h 50 apart on the timetable
The last days
AA 2378 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.