UA 4500 then KL 652 at Dulles
Detroit → Washington → Amsterdam
Timetable, Washington time
21:17UA 4500 from Detroit at the gate
18:15KL 652 to Amsterdam leaves the gate
20 h 58 apart on the timetable, overnight
KL 652 leaves 20 h 58 after UA 4500 arrives on the timetable: more than half a day, so not a connection we count.