F9 3990 then DL 5407 at Detroit
Dallas-Fort Worth → Detroit → Greensboro
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
20:59DL 5407 to Greensboro leaves the gate
23 h 16 apart on the timetable, overnight
DL 5407 leaves 23 h 16 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.