KL 777 then UA 21 at Schiphol
Port of Spain → Amsterdam → Houston
Timetable, Amsterdam time
12:00KL 777 from Port of Spain at the gate
10:20UA 21 to Houston leaves the gate
22 h 20 apart on the timetable, overnight
UA 21 leaves 22 h 20 after KL 777 arrives on the timetable: more than half a day, so not a connection we count.