DL 1500 then DL 865 at Atlanta
Cleveland → Atlanta → Boston
Timetable, Atlanta time
10:00DL 1500 from Cleveland at the gate
22:40DL 865 to Boston leaves the gate
12 h 40 apart on the timetable
DL 865 leaves 12 h 40 after DL 1500 arrives on the timetable: more than half a day, so not a connection we count.