AA 4454 then AA 4493 at JFK
Lexington → New York → Boston
Timetable, New York time
15:10AA 4454 from Lexington at the gate
20:00AA 4493 to Boston leaves the gate
4 h 50 apart on the timetable
The last days
AA 4454 and AA 4493 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.