DL 1159 then B6 1187 at Boston
Las Vegas → Boston → Los Angeles
Timetable, Boston time
19:25DL 1159 from Las Vegas at the gate
15:45B6 1187 to Los Angeles leaves the gate
20 h 20 apart on the timetable, overnight
B6 1187 leaves 20 h 20 after DL 1159 arrives on the timetable: more than half a day, so not a connection we count.