AA 3399 then AA 686 at Phoenix
Monterrey → Phoenix → San Diego
Timetable, Phoenix time
19:33AA 3399 from Monterrey at the gate
20:25AA 686 to San Diego leaves the gate
52 min apart on the timetable
The last days
AA 3399 and AA 686 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.