DL 775 then DL 518 at Atlanta
Cleveland → Atlanta → Boston
Timetable, Atlanta time
17:06DL 775 from Cleveland at the gate
16:25DL 518 to Boston leaves the gate
23 h 19 apart on the timetable, overnight
DL 518 leaves 23 h 19 after DL 775 arrives on the timetable: more than half a day, so not a connection we count.