UA 2220 then DL 5679 at Boston
Chicago O'Hare → Boston → Louisville
Timetable, Boston time
15:36UA 2220 from Chicago O'Hare at the gate
09:55DL 5679 to Louisville leaves the gate
18 h 19 apart on the timetable, overnight
DL 5679 leaves 18 h 19 after UA 2220 arrives on the timetable: more than half a day, so not a connection we count.