AA 1813 then AA 821 at O'Hare
Portland (Oregon) → Chicago → San Francisco
Timetable, Chicago time
05:07AA 1813 from Portland (Oregon) at the gate
15:10AA 821 to San Francisco leaves the gate
10 h 03 apart on the timetable
The last days
AA 1813 and AA 821 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.