DL 854 then DL 821 at Atlanta
Springfield → Atlanta → Boston
Timetable, Atlanta time
18:50DL 854 from Springfield at the gate
18:30DL 821 to Boston leaves the gate
23 h 40 apart on the timetable, overnight
DL 821 leaves 23 h 40 after DL 854 arrives on the timetable: more than half a day, so not a connection we count.