去加拿大，加拿大学生签证，在旧金山转机是否需要美国过境签证

去美国在加拿大转机，可能要停留十几个小时需要过境签证么？怎么办理加拿大过境签证

停留几个小时是免签证,但必须在飞往美国:不准在机场! "Passengers travelling to the United States :In addition to the conditions above, while travelling to the United States, nationals from approved countries must hold a confirmed onward ticket for a direct flight to the United States leaving Canada the...全部

  停留几个小时是免签证,但必须在飞往美国:不准在机场! "Passengers travelling to the United States :In addition to the conditions above, while travelling to the United States, nationals from approved countries must hold a confirmed onward ticket for a direct flight to the United States leaving Canada the same travel day (no layover or overnight stay is permitted)。
  "。收起