LA 6139 then UA 528 at San Francisco
Boston → San Francisco → Cleveland
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
23:20UA 528 to Cleveland leaves the gatealso VA 8487, NZ 9041, OZ 9525
23 h 22 apart on the timetable, overnight
UA 528 leaves 23 h 22 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.