F9 3291 then B6 188 at LAX
Las Vegas → Los Angeles → Boston
Timetable, Los Angeles time
07:48F9 3291 from Las Vegas at the gate
20:30B6 188 to Boston leaves the gate
12 h 42 apart on the timetable
B6 188 leaves 12 h 42 after F9 3291 arrives on the timetable: more than half a day, so not a connection we count.