AA 3176 then UA 406 at San Francisco
Los Angeles → San Francisco → Las Vegas
Timetable, San Francisco time
14:13AA 3176 from Los Angeles at the gatealso QF 4743
21:10UA 406 to Las Vegas leaves the gatealso AC 4025, LH 8940, NZ 9229
6 h 57 apart on the timetable
The last days
AA 3176 and UA 406 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.