F9 3990 then DL 1975 at Detroit
Dallas-Fort Worth → Detroit → Rochester
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
21:40DL 1975 to Rochester leaves the gate
23 h 57 apart on the timetable, overnight
DL 1975 leaves 23 h 57 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.