DL 539 then DL 819 at Atlanta
Portland (Oregon) → Atlanta → San Diego
Timetable, Atlanta time
19:27DL 539 from Portland (Oregon) at the gate
19:23DL 819 to San Diego leaves the gate
23 h 56 apart on the timetable, overnight
DL 819 leaves 23 h 56 after DL 539 arrives on the timetable: more than half a day, so not a connection we count.