UA 5801 then DL 2646 at O'Hare
Charleston (West Virginia) → Chicago → Boston
Timetable, Chicago time
07:05UA 5801 from Charleston (West Virginia) at the gate
19:45DL 2646 to Boston leaves the gate
12 h 40 apart on the timetable
DL 2646 leaves 12 h 40 after UA 5801 arrives on the timetable: more than half a day, so not a connection we count.