AA 4151 then AA 903 at O'Hare
Jacksonville → Chicago → Washington National
Timetable, Chicago time
14:29AA 4151 from Jacksonville at the gate
20:57AA 903 to Washington National leaves the gate
6 h 28 apart on the timetable
The last days
AA 4151 and AA 903 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.