Air Canada welcomed the Government of Canada's decision to lift remaining COVID-19 restrictions. As of October 1, 2022, all travellers arriving in Canada will no longer need to be vaccinated against COVID-19 to enter Canada or meet COVID-19 testing, quarantine or isolation requirements. 

All travellers will also no longer need to submit their public health information through ArriveCAN, however, they can continue to use the optional Advance Declaration feature in ArriveCAN to save time at the airport by submitting their customs and immigration declaration in advance of arrival.

Travellers will no longer be required to undergo health checks for air travel or wear masks on board flights. Although the masking requirement is being lifted, all travellers are strongly recommended to wear high quality and well-fitted masks for the length of their journey. Read more

Source: https://media.aircanada.com/2022-09-26-Air-Canada-Welcomes-Government-of-Canada-Decision-to-Lift-Mask,-Testing-and-ArriveCan-Requirements