An Electronic Travel Authorization (eTA) is an entry requirement for visa-exempt foreign nationals travelling to Canada by air.
If your air itinerary includes a Canadian airport, then you may need to apply for an eTA. (Applications can be submitted online and it costs just 7 CAD.) There are certain exceptions to this requirement, however. To review the most current relevant information, please visit the official online resources provided by the Government of Canada.
Please remember: Passengers are fully and exclusively responsible for obtaining the travel documentation necessary for their trip!