DL 3986 then DL 1371 at Detroit
Kalamazoo → Detroit → St Louis
Timetable, Detroit time
12:59DL 3986 from Kalamazoo at the gate
12:40DL 1371 to St Louis leaves the gate
23 h 41 apart on the timetable, overnight
DL 1371 leaves 23 h 41 after DL 3986 arrives on the timetable: more than half a day, so not a connection we count.