WN 3402 then DL 919 at Atlanta
St Louis → Atlanta → Las Vegas
Timetable, Atlanta time
19:20WN 3402 from St Louis at the gate
18:20DL 919 to Las Vegas leaves the gate
23 h apart on the timetable, overnight
DL 919 leaves 23 h after WN 3402 arrives on the timetable: more than half a day, so not a connection we count.