AA 1276 then DL 9964 at Atlanta
Dallas-Fort Worth → Atlanta → Seattle
Timetable, Atlanta time
12:42AA 1276 from Dallas-Fort Worth at the gate
18:55DL 9964 to Seattle leaves the gate
6 h 13 apart on the timetable
The last days
AA 1276 and DL 9964 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.