DL 726 then DL 5665 at Boston
Atlanta → Boston → Richmond
Timetable, Boston time
16:24DL 726 from Atlanta at the gate
15:20DL 5665 to Richmond leaves the gate
22 h 56 apart on the timetable, overnight
DL 5665 leaves 22 h 56 after DL 726 arrives on the timetable: more than half a day, so not a connection we count.