AV 6975 then UA 2168 at San Francisco
Vancouver → San Francisco → Houston
Timetable, San Francisco time
16:06AV 6975 from Vancouver at the gate
05:00UA 2168 to Houston leaves the gatealso EK 6421, VA 8084, NZ 9198
12 h 54 apart on the timetable, overnight
UA 2168 leaves 12 h 54 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.