B6 1806 then DL 5630 at Boston
Nashville → Boston → Charlotte
Timetable, Boston time
12:15B6 1806 from Nashville at the gate
11:15DL 5630 to Charlotte leaves the gate
23 h apart on the timetable, overnight
DL 5630 leaves 23 h after B6 1806 arrives on the timetable: more than half a day, so not a connection we count.