DL 553 then B6 188 at LAX
Las Vegas → Los Angeles → Boston
Timetable, Los Angeles time
08:19DL 553 from Las Vegas at the gate
20:30B6 188 to Boston leaves the gate
12 h 11 apart on the timetable
B6 188 leaves 12 h 11 after DL 553 arrives on the timetable: more than half a day, so not a connection we count.