AA 2158 then QF 3791 at San Francisco
Chicago O'Hare → San Francisco → Las Vegas
Timetable, San Francisco time
00:30AA 2158 from Chicago O'Hare at the gatealso AY 4088, RJ 7305
10:00QF 3791 to Las Vegas leaves the gate
9 h 30 apart on the timetable
The last days
AA 2158 and QF 3791 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.