UA 1734 then DL 437 at LAX
Washington → Los Angeles → Boston
Timetable, Los Angeles time
11:14UA 1734 from Washington at the gate
10:59DL 437 to Boston leaves the gate
23 h 45 apart on the timetable, overnight
DL 437 leaves 23 h 45 after UA 1734 arrives on the timetable: more than half a day, so not a connection we count.