Also, the effectiveness of such watch lists is being called into question, as the man charged with trying to bring down flight 253 on Christmas Day was not on the U. S. 'no fly' list.

同样，有人质疑这类监测名单是否有用，因为这个被控试图在圣诞节炸毁253航班的男子不在美国的“禁飞”名单上。