Non-medical masks have been required for air travellers in Canada since mid-April to prevent the spread of COVID-19. The airline said if travellers want to fly without a mask, they must provide a medical note that:has been issued by a medical professional. clearly states the passenger's name and that they have a medical condition that prevents them from wearing a mask. There are medical reasons that could make wearing a mask difficult, from certain lung conditions to anxiety disorders. As mandatory mask rules have rolled out in cities across the country during the pandemic, some groups have created and distributed illegitimate medical exemption cards to protest city bylaws.

Source: CBC News August 11, 2020 01:41 UTC