AA 9979 then AA 576 at Philadelphia
Quebec → Philadelphia → Las Vegas
Timetable, Philadelphia time
14:51AA 9979 from Quebec at the gate
18:35AA 576 to Las Vegas leaves the gate
3 h 44 apart on the timetable
The last days
AA 9979 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.