An Electronic Travel Authorization (eTA) is required for all visa-exempt foreign nationals entering Canada by air. An eTA once issued is linked to a unique traveller’s passport electronically. The eTA will need to be applied for again if the passport is new. The validity of an eTA is till the person’s passport expires or up to five years, whichever event comes first. It allows the foreign national to enter Canada for up to six months at a time.
The eTA is required for entry into Canada. Having the eTA is not a guarantee that the foreign national will be allowed entry into Canada. On arriving at the Canadian airport, the border services officer checks the complete travel documentation such as passports and other associated documents. Once everything is in order and officer is convinced of the reason of your visit, you are granted entry into Canada.