UA 1855 then DL 507 at LAX
Sacramento → Los Angeles → Boston
Timetable, Los Angeles time
09:02UA 1855 from Sacramento at the gate
21:05DL 507 to Boston leaves the gate
12 h 03 apart on the timetable
DL 507 leaves 12 h 03 after UA 1855 arrives on the timetable: more than half a day, so not a connection we count.