WN 1638 then DL 766 at Detroit
Chicago Midway → Detroit → Las Vegas
Timetable, Detroit time
17:15WN 1638 from Chicago Midway at the gate
16:59DL 766 to Las Vegas leaves the gate
23 h 44 apart on the timetable, overnight
DL 766 leaves 23 h 44 after WN 1638 arrives on the timetable: more than half a day, so not a connection we count.