DL 2577 then DL 3964 at Detroit
Newark → Detroit → Grand Rapids
Timetable, Detroit time
14:52DL 2577 from Newark at the gate
09:00DL 3964 to Grand Rapids leaves the gate
18 h 08 apart on the timetable, overnight
DL 3964 leaves 18 h 08 after DL 2577 arrives on the timetable: more than half a day, so not a connection we count.