前段想去加拿大，有的航班从英国转机，关于是否需要办过境签证咨询了英国驻荷兰大使馆，回答如下：
If you hold a valid Dutch residence permit and your transit is not
longer then 24 hours and you will get your connecting flight from the
same airport, there is no transit needed
for details see :
<http://www.britishembassy.gov.uk ... eedAVisa?url=%2Fser
vlet%2FFront%3Fpagename%3DOpenMarket%2FXcelerate%2FShowPage%26c%3DPage%2
6cid%3D1114069173357&purpose=Transit&nationality=China&location=Netherla
nds>。
实际上在有关链接中规定了四种更宽泛的可以免签证的情况。
而美国转机是必须的，以下摘自美国大使馆的网站：
There is no such thing as transitting the United States without a visa. Nationals of visa waiver countries can use the Visa Waiver Program (VWP) to transit through the United States on the way to another country, provided they meet all conditions of the VWP.
All other travelers who stop over will need a C visa or B2 visa to transit. Even if your flight only stops in the U.S. and you do not depart the plane you still require a visa as the Transit Without a Visa program has been discontinued.
Crewmembers of airlines or maritime organizations often qualify for a C visa in combination with a crewmember D visa.
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