WN 4918 then DL 5630 at Boston
St Louis → Boston → Charlotte
Timetable, Boston time
14:20WN 4918 from St Louis at the gate
13:55DL 5630 to Charlotte leaves the gate
23 h 35 apart on the timetable, overnight
DL 5630 leaves 23 h 35 after WN 4918 arrives on the timetable: more than half a day, so not a connection we count.