AA 4171 then UA 2619 at Phoenix
Ontario → Phoenix → San Diego
Timetable, Phoenix time
11:02AA 4171 from Ontario at the gate
11:20UA 2619 to San Diego leaves the gate
18 min apart on the timetable
The last days
AA 4171 and UA 2619 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.