AA 1164 then DL 139 at Boston
Washington National → Boston → New York JFK
Timetable, Boston time
09:32AA 1164 from Washington National at the gate
14:00DL 139 to New York JFK leaves the gate
4 h 28 apart on the timetable
The last days
AA 1164 and DL 139 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.