DL 3737 then DL 4159 at Detroit
Milwaukee → Detroit → Appleton
Timetable, Detroit time
20:59DL 3737 from Milwaukee at the gate
20:00DL 4159 to Appleton leaves the gate
23 h 01 apart on the timetable, overnight
DL 4159 leaves 23 h 01 after DL 3737 arrives on the timetable: more than half a day, so not a connection we count.