AS 2147 then AA 2253 at San Francisco
San Diego → San Francisco → Chicago O'Hare
Timetable, San Francisco time
13:56AS 2147 from San Diego at the gatealso QR 3349, BA 6435
17:27AA 2253 to Chicago O'Hare leaves the gatealso QF 4756
3 h 31 apart on the timetable
The last days
AS 2147 and AA 2253 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.