AA 2663 then AA 2436 at San Francisco
Philadelphia → San Francisco → Chicago O'Hare
Timetable, San Francisco time
22:59AA 2663 from Philadelphia at the gatealso BA 5442, EI 7686
08:47AA 2436 to Chicago O'Hare leaves the gatealso QF 3259, BA 5613
9 h 48 apart on the timetable, overnight
The last days
AA 2663 and AA 2436 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.