AA 2964 then AA 576 at Philadelphia
San Francisco → Philadelphia → Las Vegas
Timetable, Philadelphia time
14:50AA 2964 from San Francisco at the gate
18:35AA 576 to Las Vegas leaves the gate
3 h 45 apart on the timetable
The last days
AA 2964 and AA 576 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.