AV 2104 then UA 3911 at San Francisco
San Luis Obispo → San Francisco → Denver
Timetable, San Francisco time
19:56AV 2104 from San Luis Obispo at the gate
17:00UA 3911 to Denver leaves the gate
21 h 04 apart on the timetable, overnight
UA 3911 leaves 21 h 04 after AV 2104 arrives on the timetable: more than half a day, so not a connection we count.