DL 1486 then DL 825 at Atlanta
Tampa → Atlanta → Las Vegas
Timetable, Atlanta time
08:55DL 1486 from Tampa at the gate
21:15DL 825 to Las Vegas leaves the gate
12 h 20 apart on the timetable
DL 825 leaves 12 h 20 after DL 1486 arrives on the timetable: more than half a day, so not a connection we count.