AA 2120 then AS 776 at San Francisco
Dallas-Fort Worth → San Francisco → Las Vegas
Timetable, San Francisco time
08:56AA 2120 from Dallas-Fort Worth at the gatealso IB 8018
13:47AS 776 to Las Vegas leaves the gatealso DE 5109, AA 7518, BA 7559, CX 7856
4 h 51 apart on the timetable
The last days
AA 2120 and AS 776 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.