AV 6975 then AA 2524 at San Francisco
Vancouver → San Francisco → Chicago O'Hare
Timetable, San Francisco time
23:01AV 6975 from Vancouver at the gate
15:04AA 2524 to Chicago O'Hare leaves the gatealso QF 4550, FJ 5015
16 h 03 apart on the timetable, overnight
AA 2524 leaves 16 h 03 after AV 6975 arrives on the timetable: more than half a day, so not a connection we count.