AA 3559 then AA 523 at O'Hare
Moline → Chicago → Washington National
Timetable, Chicago time
18:29AA 3559 from Moline at the gate
19:29AA 523 to Washington National leaves the gate
1 h apart on the timetable
The last days
AA 3559 and AA 523 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.