WN 1638 then UA 4012 at Detroit
Chicago Midway → Detroit → Houston
Timetable, Detroit time
17:15WN 1638 from Chicago Midway at the gate
16:45UA 4012 to Houston leaves the gate
23 h 30 apart on the timetable, overnight
UA 4012 leaves 23 h 30 after WN 1638 arrives on the timetable: more than half a day, so not a connection we count.