AA 9781 then DL 1686 at Philadelphia
New York LaGuardia → Philadelphia → Detroit
Timetable, Philadelphia time
06:00AA 9781 from New York LaGuardia at the gate
20:14DL 1686 to Detroit leaves the gate
14 h 14 apart on the timetable
DL 1686 leaves 14 h 14 after AA 9781 arrives on the timetable: more than half a day, so not a connection we count.