AA 834 then B6 8442 at Boston
Philadelphia → Boston → New York JFK
Timetable, Boston time
23:54AA 834 from Philadelphia at the gate
09:30B6 8442 to New York JFK leaves the gate
9 h 36 apart on the timetable, overnight
The last days
AA 834 and B6 8442 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.