UA 1970 then AC 744 at San Francisco
Cleveland → San Francisco → Toronto
Timetable, San Francisco time
21:45UA 1970 from Cleveland at the gatealso VA 8489, NZ 9046, OZ 9526
16:40AC 744 to Toronto leaves the gatealso NZ 4501, NZ 4503, UA 8396
18 h 55 apart on the timetable, overnight
AC 744 leaves 18 h 55 after UA 1970 arrives on the timetable: more than half a day, so not a connection we count.