AA 1283 then DL 811 at Miami
Philadelphia → Miami → Los Angeles
Timetable, Miami time
13:42AA 1283 from Philadelphia at the gate
18:34DL 811 to Los Angeles leaves the gate
4 h 52 apart on the timetable
The last days
AA 1283 and DL 811 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.