DL 1524 then AA 9973 at Atlanta
St Louis → Atlanta → Washington National
Timetable, Atlanta time
08:35DL 1524 from St Louis at the gate
17:16AA 9973 to Washington National leaves the gate
8 h 41 apart on the timetable
The last days
DL 1524 and AA 9973 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.