DL 729 then DL 2718 at Atlanta
San Diego → Atlanta → Gulfport
Timetable, Atlanta time
13:01DL 729 from San Diego at the gate
12:43DL 2718 to Gulfport leaves the gate
23 h 42 apart on the timetable, overnight
DL 2718 leaves 23 h 42 after DL 729 arrives on the timetable: more than half a day, so not a connection we count.