LA 6139 then AC 4438 at San Francisco
Boston → San Francisco → Fresno
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
22:35AC 4438 to Fresno leaves the gatealso UA 4699, LH 8883
22 h 37 apart on the timetable, overnight
AC 4438 leaves 22 h 37 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.