AV 6985 then UA 817 at San Francisco
Vancouver → San Francisco → Mexico City
Timetable, San Francisco time
16:06AV 6985 from Vancouver at the gate
13:14UA 817 to Mexico City leaves the gatealso AC 5402, NH 7368, NZ 9823
21 h 08 apart on the timetable, overnight
UA 817 leaves 21 h 08 after AV 6985 arrives on the timetable: more than half a day, so not a connection we count.