Cases of transmission of communicable diseases on aircraft are very rare. The reasons for the apparently low rate of in-flight transmission are not fully determined but are thought to include a combination of factors, such as the inherent characteristics of cabin air flow.
Various government bodies have confirmed the risk of onboard transmission is exceedingly low, which accords with scientific studies on communicable diseases and air travel.
Air Canada’s additional measures such as pre-flight screening questionnaires, temperature monitoring and mandatory face coverings are also seen to be effective.
Find out more in this helpful Fact Sheet.