AA 1866 then XA 408 at Philadelphia
Denver → Philadelphia → Miami
Timetable, Philadelphia time
05:35AA 1866 from Denver at the gate
15:30XA 408 to Miami leaves the gate
9 h 55 apart on the timetable
The last days
AA 1866 and XA 408 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.