AA 873 then AA 1187 at O'Hare
Atlanta → Chicago → Washington National
Timetable, Chicago time
12:29AA 873 from Atlanta at the gate
18:55AA 1187 to Washington National leaves the gate
6 h 26 apart on the timetable
The last days
AA 873 and AA 1187 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.