AA 398 then UA 3900 at San Francisco
Charlotte → San Francisco → Los Angeles
Timetable, San Francisco time
13:52AA 398 from Charlotte at the gate
18:00UA 3900 to Los Angeles leaves the gate
4 h 08 apart on the timetable
The last days
AA 398 and UA 3900 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.