AA 557 then DL 1892 at Atlanta
Philadelphia → Atlanta → Chattanooga
Timetable, Atlanta time
18:09AA 557 from Philadelphia at the gate
14:30DL 1892 to Chattanooga leaves the gate
20 h 21 apart on the timetable, overnight
DL 1892 leaves 20 h 21 after AA 557 arrives on the timetable: more than half a day, so not a connection we count.