AA 3239 then B6 124 at LAX
Miami → Los Angeles → New York JFK
Timetable, Los Angeles time
12:52AA 3239 from Miami at the gate
22:46B6 124 to New York JFK leaves the gate
9 h 54 apart on the timetable
The last days
AA 3239 and B6 124 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.