UA 1553 then DL 437 at LAX
San José (Costa Rica) → Los Angeles → Boston
Timetable, Los Angeles time
11:08UA 1553 from San José (Costa Rica) at the gate
10:59DL 437 to Boston leaves the gate
23 h 51 apart on the timetable, overnight
DL 437 leaves 23 h 51 after UA 1553 arrives on the timetable: more than half a day, so not a connection we count.