AA 436 then AA 1653 at Boston
Charlotte → Boston → Phoenix
Timetable, Boston time
09:17AA 436 from Charlotte at the gate
10:12AA 1653 to Phoenix leaves the gate
55 min 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
AA 436 and AA 1653 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.