AA 525 then AA 4618 at JFK
Miami → New York → Boston
Timetable, New York time
09:43AA 525 from Miami at the gate
15:34AA 4618 to Boston leaves the gate
5 h 51 apart on the timetable
The last days
AA 525 and AA 4618 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.