Before the establishment of the eTA program the Government of Canada had a limited capacity to screen international visitors.  Citizens of countries that could enter without a visa were not examined until they arrived at their port of entry in Canada. The Canadian authorities allow all travelers or their designated third party to fill out a secured online travel authorization request available on its web site. Once all information and trip details are submitted, the authorities will analyze the information and decide whether the applicant meets the requirements and qualifies for a Canada electronic travel authorization. The system will automatically provide an answer before your travel date. The Airline will verify with the Canadian authorities that an eTA was granted.