DL 3869 then DL 1371 at Detroit
Elmira → Detroit → St Louis
Timetable, Detroit time
15:11DL 3869 from Elmira at the gate
12:40DL 1371 to St Louis leaves the gate
21 h 29 apart on the timetable, overnight
DL 1371 leaves 21 h 29 after DL 3869 arrives on the timetable: more than half a day, so not a connection we count.