B6 387 then UA 418 at LAX
Boston → Los Angeles → Washington
Timetable, Los Angeles time
00:55B6 387 from Boston at the gate
23:17UA 418 to Washington leaves the gate
22 h 22 apart on the timetable
UA 418 leaves 22 h 22 after B6 387 arrives on the timetable: more than half a day, so not a connection we count.