KL 618 then HV 5951 at Schiphol
Boston → Amsterdam → Lisbon
Timetable, Amsterdam time
09:45KL 618 from Boston at the gate
06:50HV 5951 to Lisbon leaves the gate
21 h 05 apart on the timetable, overnight
HV 5951 leaves 21 h 05 after KL 618 arrives on the timetable: more than half a day, so not a connection we count.