DL 5223 then DL 738 at JFK
Buffalo → New York → Los Angeles
Timetable, New York time
12:48DL 5223 from Buffalo at the gate
15:20DL 738 to Los Angeles leaves the gate
2 h 32 apart on the timetable
The last days
DL 5223 and DL 738 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.