DL 1492 then DL 3559 at Salt Lake City
St Louis → Salt Lake City → Northwest Arkansas
Timetable, Salt Lake City time
21:18DL 1492 from St Louis at the gate
20:45DL 3559 to Northwest Arkansas leaves the gate
23 h 27 apart on the timetable, overnight
DL 3559 leaves 23 h 27 after DL 1492 arrives on the timetable: more than half a day, so not a connection we count.