AA 5380 then AA 1528 at Philadelphia
Milwaukee → Philadelphia → San Francisco
Timetable, Philadelphia time
09:13AA 5380 from Milwaukee at the gate
15:56AA 1528 to San Francisco leaves the gate
6 h 43 apart on the timetable
The last days
AA 5380 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.