DL 2399 then DL 1371 at Detroit
Los Angeles → Detroit → St Louis
Timetable, Detroit time
13:18DL 2399 from Los Angeles at the gate
12:40DL 1371 to St Louis leaves the gate
23 h 22 apart on the timetable, overnight
DL 1371 leaves 23 h 22 after DL 2399 arrives on the timetable: more than half a day, so not a connection we count.