F9 2021 then DL 2603 at Detroit
Philadelphia → Detroit → New York LaGuardia
Timetable, Detroit time
00:05F9 2021 from Philadelphia at the gate
21:35DL 2603 to New York LaGuardia leaves the gate
21 h 30 apart on the timetable
DL 2603 leaves 21 h 30 after F9 2021 arrives on the timetable: more than half a day, so not a connection we count.