DL 2646 then KL 618 at Boston
Chicago O'Hare → Boston → Amsterdam
Timetable, Boston time
23:08DL 2646 from Chicago O'Hare at the gate
20:55KL 618 to Amsterdam leaves the gate
21 h 47 apart on the timetable, overnight
KL 618 leaves 21 h 47 after DL 2646 arrives on the timetable: more than half a day, so not a connection we count.