LA 6139 then AS 2138 at San Francisco
Boston → San Francisco → Los Angeles
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
22:13AS 2138 to Los Angeles leaves the gate
22 h 15 apart on the timetable, overnight
AS 2138 leaves 22 h 15 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.