F9 3990 then DL 4013 at Detroit
Dallas-Fort Worth → Detroit → Lexington
Timetable, Detroit time
21:43F9 3990 from Dallas-Fort Worth at the gate
19:45DL 4013 to Lexington leaves the gate
22 h 02 apart on the timetable, overnight
DL 4013 leaves 22 h 02 after F9 3990 arrives on the timetable: more than half a day, so not a connection we count.