AA 53 then AA 1586 at Miami
Rome → Miami → New York JFK
Timetable, Miami time
17:30AA 53 from Rome at the gate
18:25AA 1586 to New York JFK leaves the gate
55 min apart on the timetable
The last days
AA 53 and AA 1586 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.