AF 2478 then UA 2278 at San Francisco
Atlanta → San Francisco → Chicago O'Hare
Timetable, San Francisco time
17:25AF 2478 from Atlanta at the gatealso VS 5291
22:45UA 2278 to Chicago O'Hare leaves the gatealso VA 8105
5 h 20 apart on the timetable
The last days
AF 2478 and UA 2278 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.