F9 3990 then DL 1633 at Detroit
Dallas-Fort Worth → Detroit → Houston
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
20:15DL 1633 to Houston leaves the gate
22 h 32 apart on the timetable, overnight
DL 1633 leaves 22 h 32 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.