AA 6277 then BA 6664 at San Francisco
Los Angeles → San Francisco → Chicago O'Hare
Timetable, San Francisco time
11:02AA 6277 from Los Angeles at the gate
13:42BA 6664 to Chicago O'Hare leaves the gate
2 h 40 apart on the timetable
The last days
AA 6277 and BA 6664 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.