AA 328 then AA 821 at O'Hare
Dallas-Fort Worth → Chicago → San Francisco
Timetable, Chicago time
11:09AA 328 from Dallas-Fort Worth at the gate
15:10AA 821 to San Francisco leaves the gate
4 h 01 apart on the timetable
The last days
AA 328 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.