F9 2021 then AA 4712 at Detroit
Philadelphia → Detroit → Washington National
Timetable, Detroit time
00:05F9 2021 from Philadelphia at the gate
16:46AA 4712 to Washington National leaves the gate
16 h 41 apart on the timetable
AA 4712 leaves 16 h 41 after F9 2021 arrives on the timetable: more than half a day, so not a connection we count.