DL 3199 then DL 1507 at Atlanta
Gulfport → Atlanta → Tri-Cities
Timetable, Atlanta time
12:25DL 3199 from Gulfport at the gate
12:06DL 1507 to Tri-Cities leaves the gate
23 h 41 apart on the timetable, overnight
DL 1507 leaves 23 h 41 after DL 3199 arrives on the timetable: more than half a day, so not a connection we count.