AA 910 then AA 551 at Miami
Medellín → Miami → Philadelphia
Timetable, Miami time
05:05AA 910 from Medellín at the gate
09:04AA 551 to Philadelphia leaves the gate
3 h 59 apart on the timetable
The last days
AA 910 and AA 551 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.