AA 3100 then UA 1005 at Houston
Miami → Houston → Washington National
Timetable, Houston time
08:59AA 3100 from Miami at the gate
12:07UA 1005 to Washington National leaves the gate
3 h 08 apart on the timetable
The last days
AA 3100 and UA 1005 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.