DL 560 then DL 1837 at Atlanta
Seattle → Atlanta → Washington
Timetable, Atlanta time
07:13DL 560 from Seattle at the gate
14:07DL 1837 to Washington leaves the gate
6 h 54 apart on the timetable
The last days
DL 560 and DL 1837 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.