AV 6975 then NH 7242 at San Francisco
Vancouver → San Francisco → Chicago O'Hare
Timetable, San Francisco time
16:06AV 6975 from Vancouver at the gate
12:27NH 7242 to Chicago O'Hare leaves the gate
20 h 21 apart on the timetable, overnight
NH 7242 leaves 20 h 21 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.