DL 9975 then AA 2455 at Boston
Miami (MIA) → Boston → Los Angeles
Timetable, Boston time
02:50DL 9975 from Miami (MIA) at the gate
08:00AA 2455 to Los Angeles leaves the gate
5 h 10 apart on the timetable
Boston’s board gives an arrival time for only about 59% of its flights, so many days show no gate time.
The last days
DL 9975 and AA 2455 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.