UA 5588 then DL 507 at LAX
Fresno → Los Angeles → Boston
Timetable, Los Angeles time
07:27UA 5588 from Fresno at the gate
21:05DL 507 to Boston leaves the gate
13 h 38 apart on the timetable
DL 507 leaves 13 h 38 after UA 5588 arrives on the timetable: more than half a day, so not a connection we count.