AA 1874 then AA 2446 at Boston
Philadelphia → Boston → Miami (MIA)
Timetable, Boston time
23:13AA 1874 from Philadelphia at the gate
11:08AA 2446 to Miami (MIA) leaves the gate
11 h 55 apart on the timetable, overnight
Boston’s board gives an arrival time for only about 59% of its flights, so many days show no gate time.
The last days
AA 1874 and AA 2446 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.