WN 3402 then DL 836 at Atlanta
St Louis → Atlanta → Phoenix
Timetable, Atlanta time
19:20WN 3402 from St Louis at the gate
16:25DL 836 to Phoenix leaves the gate
21 h 05 apart on the timetable, overnight
DL 836 leaves 21 h 05 after WN 3402 arrives on the timetable: more than half a day, so not a connection we count.