DL 864 then DL 1371 at Detroit
Las Vegas → Detroit → St Louis
Timetable, Detroit time
12:49DL 864 from Las Vegas at the gate
12:40DL 1371 to St Louis leaves the gate
23 h 51 apart on the timetable, overnight
DL 1371 leaves 23 h 51 after DL 864 arrives on the timetable: more than half a day, so not a connection we count.