AA 1399 then AA 1976 at Miami
Pittsburgh → Miami → San Juan
Timetable, Miami time
09:00AA 1399 from Pittsburgh at the gate
10:43AA 1976 to San Juan leaves the gate
1 h 43 apart on the timetable
The last days
AA 1399 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.