F9 3990 then DL 2402 at Detroit
Dallas-Fort Worth → Detroit → Philadelphia
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
21:31DL 2402 to Philadelphia leaves the gate
23 h 48 apart on the timetable, overnight
DL 2402 leaves 23 h 48 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.