AA 2783 then DL 9966 at Seattle
Phoenix → Seattle → Los Angeles
Timetable, Seattle time
13:47AA 2783 from Phoenix at the gate
20:00DL 9966 to Los Angeles leaves the gate
6 h 13 apart on the timetable
Seattle’s board gives a departure time for only about 57% of its flights, so many days show no gate time.
The last days
AA 2783 and DL 9966 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.