DL 755 then DL 1507 at Atlanta
Las Vegas → Atlanta → Tri-Cities
Timetable, Atlanta time
12:46DL 755 from Las Vegas at the gate
12:06DL 1507 to Tri-Cities leaves the gate
23 h 20 apart on the timetable, overnight
DL 1507 leaves 23 h 20 after DL 755 arrives on the timetable: more than half a day, so not a connection we count.