AA 2253 then AA 939 at San Francisco
Chicago O'Hare → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
16:22AA 2253 from Chicago O'Hare at the gatealso QF 4756
23:23AA 939 to Dallas-Fort Worth leaves the gatealso CZ 1632
7 h 01 apart on the timetable
The last days
AA 2253 and AA 939 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.