SQ 12 then DL 437 at LAX
Tokyo Narita → Los Angeles → Boston
Timetable, Los Angeles time
11:15SQ 12 from Tokyo Narita at the gate
10:50DL 437 to Boston leaves the gate
23 h 35 apart on the timetable, overnight
DL 437 leaves 23 h 35 after SQ 12 arrives on the timetable: more than half a day, so not a connection we count.