1. Get your passport, credit or debit card ready, and read the help document. Apply online for an eTA.When using U.S. preclearance facilities at a Canadian airport, you must meet U.S. entry requirements. Additional information. In addition to your passport, you may need a travel authorization such as a visa or an Electronic Travel Authorization (eTA) to enter Canada. A Compliant Card cannot be used for international travel. International travel, including Canada and Mexico, still requires a passport. Birth certificates are sufficient for children under 16. Use our Form Filler to fill out your form and print it. For the best experience, use a desktop or laptop computer.