AA 4778 then DL 2709 at Houston
Philadelphia → Houston → Atlanta
Timetable, Houston time
13:55AA 4778 from Philadelphia at the gate
08:05DL 2709 to Atlanta leaves the gate
18 h 10 apart on the timetable, overnight
DL 2709 leaves 18 h 10 after AA 4778 arrives on the timetable: more than half a day, so not a connection we count.