AA 5050 then DL 726 at Atlanta
Philadelphia → Atlanta → Boston
Timetable, Atlanta time
14:00AA 5050 from Philadelphia at the gate
13:50DL 726 to Boston leaves the gate
23 h 50 apart on the timetable, overnight
DL 726 leaves 23 h 50 after AA 5050 arrives on the timetable: more than half a day, so not a connection we count.