AC 4121 then AC 742 at San Francisco
Ontario → San Francisco → Toronto
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
14:00AC 742 to Toronto leaves the gatealso OS 8357
20 h 10 apart on the timetable, overnight
AC 742 leaves 20 h 10 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.