WN 3243 then DL 519 at Atlanta
Austin → Atlanta → Denver
Timetable, Atlanta time
18:00WN 3243 from Austin at the gate
17:09DL 519 to Denver leaves the gate
23 h 09 apart on the timetable, overnight
DL 519 leaves 23 h 09 after WN 3243 arrives on the timetable: more than half a day, so not a connection we count.