DL 2331 then DL 1371 at Detroit
Philadelphia → Detroit → St Louis
Timetable, Detroit time
14:10DL 2331 from Philadelphia at the gate
12:40DL 1371 to St Louis leaves the gate
22 h 30 apart on the timetable, overnight
DL 1371 leaves 22 h 30 after DL 2331 arrives on the timetable: more than half a day, so not a connection we count.