AS 309 then AA 597 at San Francisco
Los Angeles → San Francisco → Chicago O'Hare
Timetable, San Francisco time
14:22AS 309 from Los Angeles at the gatealso QR 2096, DE 5030
17:22AA 597 to Chicago O'Hare leaves the gatealso QF 4712
3 h apart on the timetable
The last days
AS 309 and AA 597 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.