1. Get your passport, credit or debit card ready, and read the help document. The eTA can be obtained online through a short application form on the Government of Canada's website and electronically linked to your passport number.You will need your passport when completing the application. Passengers flying to Canada require an Electronic Travel Authorization (eTA). The application needs to be completed 72 hours prior to your departure date. Visa-exempt foreign nationals need an eTA to fly to or transit through a Canadian airport. Applying for an eTA is a simple online process. Most applicants can expect to get an email response within minutes of applying. This form constitutes an official authorization for a Canadian office abroad to charge your credit card for the payment of services requested. A consent letter demonstrates that a child has permission to travel outside Canada from every parent or guardian who is not accompanying them on the trip.