Reminder: Electronic Travel Authorization (eTA) is obligatory when entering Canada

The system is similar to ESTA in the USA and ETA in Australia. An eTA is a travel authorization, not a visa, and it does not guarantee the right for an entry to the country. It is required from visa-exempt foreign nationals (including Finnish citizens) who fly to, or transit through a Canadian airport.

More information from Canada's Immigration and citizenship website(Link to another website.).