AA 3449 then UA 3909 at O'Hare
Fargo → Chicago → San Francisco
Timetable, Chicago time
15:04AA 3449 from Fargo at the gate
19:30UA 3909 to San Francisco leaves the gate
4 h 26 apart on the timetable
The last days
AA 3449 and UA 3909 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.