AA 2318 then AA 2638 at Miami
Jacksonville → Miami → Punta Cana
Timetable, Miami time
07:26AA 2318 from Jacksonville at the gate
08:25AA 2638 to Punta Cana leaves the gate
59 min apart on the timetable
The last days
AA 2318 and AA 2638 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.