AV 6985 then UA 3915 at San Francisco
Vancouver → San Francisco → Houston
Timetable, San Francisco time
16:06AV 6985 from Vancouver at the gate
13:30UA 3915 to Houston leaves the gate
21 h 24 apart on the timetable, overnight
UA 3915 leaves 21 h 24 after AV 6985 arrives on the timetable: more than half a day, so not a connection we count.