AA 678 then AA 6340 at Houston
Miami → Houston → Los Angeles
Timetable, Houston time
16:44AA 678 from Miami at the gate
20:19AA 6340 to Los Angeles leaves the gate
3 h 35 apart on the timetable
The last days
AA 678 and AA 6340 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.