UA 1853 then DL 4087 at LAX
Cleveland → Los Angeles → San Diego
Timetable, Los Angeles time
20:27UA 1853 from Cleveland at the gate
17:46DL 4087 to San Diego leaves the gate
21 h 19 apart on the timetable, overnight
DL 4087 leaves 21 h 19 after UA 1853 arrives on the timetable: more than half a day, so not a connection we count.