AA 533 then AA 3073 at Philadelphia
Miami → Philadelphia → Boston
Timetable, Philadelphia time
12:00AA 533 from Miami at the gate
15:45AA 3073 to Boston leaves the gate
3 h 45 apart on the timetable
The last days
AA 533 and AA 3073 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.