LA 6139 then CM 1884 at San Francisco
Boston → San Francisco → Las Vegas
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
22:59CM 1884 to Las Vegas leaves the gatealso UA 2400, AC 4123, LH 9212, NZ 9225
23 h 01 apart on the timetable, overnight
CM 1884 leaves 23 h 01 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.