AA 509 then AA 1976 at Miami
Houston → Miami → San Juan
Timetable, Miami time
09:45AA 509 from Houston at the gate
10:43AA 1976 to San Juan leaves the gate
58 min apart on the timetable
The last days
AA 509 and AA 1976 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.