DL 2951 then DL 726 at Atlanta
Hartford → Atlanta → Boston
Timetable, Atlanta time
14:15DL 2951 from Hartford at the gate
13:50DL 726 to Boston leaves the gate
23 h 35 apart on the timetable, overnight
DL 726 leaves 23 h 35 after DL 2951 arrives on the timetable: more than half a day, so not a connection we count.