CM 2528 then UA 1496 at San Francisco
Ontario → San Francisco → Boston
Timetable, San Francisco time
20:10CM 2528 from Ontario at the gatealso AC 4112
14:42UA 1496 to Boston leaves the gatealso VA 8307, NZ 9013
18 h 32 apart on the timetable, overnight
UA 1496 leaves 18 h 32 after CM 2528 arrives on the timetable: more than half a day, so not a connection we count.