AA 1801 then AF 2517 at Newark
Miami → New York → Atlanta
Timetable, New York time
11:30AA 1801 from Miami at the gate
15:18AF 2517 to Atlanta leaves the gate
3 h 48 apart on the timetable
The last days
AA 1801 and AF 2517 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.