AA 2253 then DL 8844 at San Francisco
Chicago O'Hare → San Francisco → Los Angeles
Timetable, San Francisco time
16:22AA 2253 from Chicago O'Hare at the gatealso QF 4756
16:40DL 8844 to Los Angeles leaves the gate
18 min apart on the timetable
The last days
AA 2253 and DL 8844 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.