DL 1427 then DL 3964 at Detroit
Raleigh-Durham → Detroit → Grand Rapids
Timetable, Detroit time
11:45DL 1427 from Raleigh-Durham at the gate
09:00DL 3964 to Grand Rapids leaves the gate
21 h 15 apart on the timetable, overnight
DL 3964 leaves 21 h 15 after DL 1427 arrives on the timetable: more than half a day, so not a connection we count.