UA 1846 then B6 9003 at Boston
Denver → Boston → Columbia
Timetable, Boston time
19:39UA 1846 from Denver at the gate
09:50B6 9003 to Columbia leaves the gate
14 h 11 apart on the timetable, overnight
B6 9003 leaves 14 h 11 after UA 1846 arrives on the timetable: more than half a day, so not a connection we count.