Uma mudança nos planos não afetará seu eTA ou sua validade; Recomenda-se que você obtenha seu eTA antes de reservar seu voo.
Do I need to apply for an eTA before I book my airline ticket?
We recommend that you submit your eTA application before you buy your airline ticket. This way, if you encounter any difficulties when you apply, you can resolve any issues before you book your flight. In most cases, the eTA will be issued in minutes, which will not delay your flight booking. However, some requests may need more time to process.An Electronic Travel Authorization (eTA) is an entry requirement for visa-exempt foreign nationals travelling to Canada by air. An eTA is electronically linked to a traveller’s passport. It is valid for up to five years or until the passport expires, whichever comes first. If you get a new passport, you need to get a new eTA.