UA 2101 then B6 9003 at Boston
Chicago O'Hare → Boston → Columbia
Timetable, Boston time
17:24UA 2101 from Chicago O'Hare at the gate
09:50B6 9003 to Columbia leaves the gate
16 h 26 apart on the timetable, overnight
B6 9003 leaves 16 h 26 after UA 2101 arrives on the timetable: more than half a day, so not a connection we count.