AA 2407 then AA 2642 at San Francisco
Philadelphia → San Francisco → Chicago O'Hare
Timetable, San Francisco time
11:35AA 2407 from Philadelphia at the gate
15:18AA 2642 to Chicago O'Hare leaves the gatealso BA 5612, GF 6849
3 h 43 apart on the timetable
The last days
AA 2407 and AA 2642 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.