DL 5303 then DL 1371 at Detroit
Pittsburgh → Detroit → St Louis
Timetable, Detroit time
13:30DL 5303 from Pittsburgh at the gate
12:40DL 1371 to St Louis leaves the gate
23 h 10 apart on the timetable, overnight
DL 1371 leaves 23 h 10 after DL 5303 arrives on the timetable: more than half a day, so not a connection we count.