DL 1625 then DL 855 at Atlanta
Memphis → Atlanta → Boston
Timetable, Atlanta time
10:30DL 1625 from Memphis at the gate
09:55DL 855 to Boston leaves the gate
23 h 25 apart on the timetable, overnight
DL 855 leaves 23 h 25 after DL 1625 arrives on the timetable: more than half a day, so not a connection we count.