F9 3990 then DL 4159 at Detroit
Dallas-Fort Worth → Detroit → Appleton
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
20:50DL 4159 to Appleton leaves the gate
23 h 07 apart on the timetable, overnight
DL 4159 leaves 23 h 07 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.