AA 5277 then B6 560 at Philadelphia
Memphis → Philadelphia → Boston
Timetable, Philadelphia time
19:41AA 5277 from Memphis at the gate
17:58B6 560 to Boston leaves the gate
22 h 17 apart on the timetable, overnight
B6 560 leaves 22 h 17 after AA 5277 arrives on the timetable: more than half a day, so not a connection we count.