EK 9989 then DL 2646 at O'Hare
Liege → Chicago → Boston
Timetable, Chicago time
17:15EK 9989 from Liege at the gate
16:40DL 2646 to Boston leaves the gate
23 h 25 apart on the timetable, overnight
DL 2646 leaves 23 h 25 after EK 9989 arrives on the timetable: more than half a day, so not a connection we count.