DL 3951 then DL 3963 at LAX
Phoenix Sky Harbor → Los Angeles → San Diego
Timetable, Los Angeles time
14:29DL 3951 from Phoenix Sky Harbor at the gate
14:11DL 3963 to San Diego leaves the gate
23 h 42 apart on the timetable, overnight
DL 3963 leaves 23 h 42 after DL 3951 arrives on the timetable: more than half a day, so not a connection we count.