AA 820 then DL 1798 at Atlanta
Dallas-Fort Worth → Atlanta → Washington National
Timetable, Atlanta time
10:22AA 820 from Dallas-Fort Worth at the gate
11:14DL 1798 to Washington National leaves the gate
52 min apart on the timetable
The last days
AA 820 and DL 1798 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.