DL 706 then DL 3171 at Atlanta
Denver → Atlanta → Huntsville
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
17:45DL 3171 to Huntsville leaves the gate
23 h 44 apart on the timetable, overnight
DL 3171 leaves 23 h 44 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.