F9 1067 then AA 4778 at Houston
Miami → Houston → Philadelphia
Timetable, Houston time
13:47F9 1067 from Miami at the gate
14:25AA 4778 to Philadelphia leaves the gate
38 min apart on the timetable
The last days
F9 1067 and AA 4778 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.