AA 944 then DL 747 at JFK
Miami → New York → Los Angeles
Timetable, New York time
00:58AA 944 from Miami at the gate
11:00DL 747 to Los Angeles leaves the gate
10 h 02 apart on the timetable
The last days
AA 944 and DL 747 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.