AA 5456 then DL 2718 at Atlanta
Philadelphia → Atlanta → Gulfport
Timetable, Atlanta time
13:00AA 5456 from Philadelphia at the gate
12:43DL 2718 to Gulfport leaves the gate
23 h 43 apart on the timetable, overnight
DL 2718 leaves 23 h 43 after AA 5456 arrives on the timetable: more than half a day, so not a connection we count.