F9 3409 then DL 1329 at Atlanta
Detroit → Atlanta → Philadelphia
Timetable, Atlanta time
17:16F9 3409 from Detroit at the gate
16:34DL 1329 to Philadelphia leaves the gate
23 h 18 apart on the timetable, overnight
DL 1329 leaves 23 h 18 after F9 3409 arrives on the timetable: more than half a day, so not a connection we count.