DL 5373 then DL 3964 at Detroit
Chicago Midway → Detroit → Grand Rapids
Timetable, Detroit time
11:43DL 5373 from Chicago Midway at the gate
09:00DL 3964 to Grand Rapids leaves the gate
21 h 17 apart on the timetable, overnight
DL 3964 leaves 21 h 17 after DL 5373 arrives on the timetable: more than half a day, so not a connection we count.