UA 2433 then B6 1187 at Boston
Newark → Boston → Los Angeles
Timetable, Boston time
17:27UA 2433 from Newark at the gate
15:45B6 1187 to Los Angeles leaves the gate
22 h 18 apart on the timetable, overnight
B6 1187 leaves 22 h 18 after UA 2433 arrives on the timetable: more than half a day, so not a connection we count.