AA 2353 then AA 1528 at Philadelphia
Los Angeles → Philadelphia → San Francisco
Timetable, Philadelphia time
07:06AA 2353 from Los Angeles at the gate
15:56AA 1528 to San Francisco leaves the gate
8 h 50 apart on the timetable
The last days
AA 2353 and AA 1528 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.