As border restrictions are easing up, many countries including Canada, still require air passengers to meet special COVID entry requirements, which may include being fully vaccinated and pre-entry COVID testing. Air passengers must have all appropriate documentation required to enter the country they are going to, including proof that they meet any COVID-related requirements. Failure to do so can result in airlines refusing to allow air passengers to board their flights.
Under the terms and conditions of your ticket, airlines may be allowed to refuse to transport you in certain situations. This can arise because the airline is required to comply with applicable government regulations or to address force majeure situations (e.g., events sometimes described as “acts of God”). This means that, even if you hold a valid ticket/itinerary, the airline might not be able to allow you to travel.
Remember – you must have the proper documentation, including proof of full vaccination and negative COVID testing, when these requirements apply. Passengers have the responsibility to find out about such requirements before travelling.
The Air Passenger Protection Regulations (APPR) do not provide protections when an airline refuses to transport you because you did not show the required documentation. The airline's obligations towards you, should you be refused transportation, would be provided for within its tariff. A tariff consists of the airlines' conditions of carriage and lists such things as their ticket fees, fares and policies.
For more information concerning requirements and planning for travel, consult the Canada Border Services Agency's website.