F9 2021 then DL 4013 at Detroit
Philadelphia → Detroit → Lexington
Timetable, Detroit time
00:05F9 2021 from Philadelphia at the gate
19:56DL 4013 to Lexington leaves the gate
19 h 51 apart on the timetable
DL 4013 leaves 19 h 51 after F9 2021 arrives on the timetable: more than half a day, so not a connection we count.