AA 3258 then AA 38 at Miami
Houston → Miami → London
Timetable, Miami time
13:23AA 3258 from Houston at the gate
19:30AA 38 to London leaves the gate
6 h 07 apart on the timetable
The last days
AA 3258 and AA 38 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.