F9 4937 then DL 4997 at Detroit
Raleigh-Durham → Detroit → Lexington
Timetable, Detroit time
17:59F9 4937 from Raleigh-Durham at the gate
15:52DL 4997 to Lexington leaves the gate
21 h 53 apart on the timetable, overnight
DL 4997 leaves 21 h 53 after F9 4937 arrives on the timetable: more than half a day, so not a connection we count.