AA 2121 then AA 2778 at Phoenix
Reno → Phoenix → Boston
Timetable, Phoenix time
12:44AA 2121 from Reno at the gate
13:43AA 2778 to Boston leaves the gate
59 min apart on the timetable
The last days
AA 2121 and AA 2778 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.