DL 539 then WN 261 at Atlanta
Portland (Oregon) → Atlanta → St Louis
Timetable, Atlanta time
19:27DL 539 from Portland (Oregon) at the gate
19:02WN 261 to St Louis leaves the gate
23 h 35 apart on the timetable, overnight
WN 261 leaves 23 h 35 after DL 539 arrives on the timetable: more than half a day, so not a connection we count.