B6 434 then B6 1187 at Boston
San Francisco → Boston → Los Angeles
Timetable, Boston time
16:05B6 434 from San Francisco at the gate
15:45B6 1187 to Los Angeles leaves the gate
23 h 40 apart on the timetable, overnight
B6 1187 leaves 23 h 40 after B6 434 arrives on the timetable: more than half a day, so not a connection we count.