AA 5151 then AA 1844 at Philadelphia
Cincinnati → Philadelphia → San Diego
Timetable, Philadelphia time
07:50AA 5151 from Cincinnati at the gate
16:00AA 1844 to San Diego leaves the gate
8 h 10 apart on the timetable
The last days
AA 5151 and AA 1844 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.