If you are denied boarding, your flight is cancelled or delayed for at least two hours, or your baggage is lost or damaged, you may be entitled to certain standards of treatment and compensation under the Air Passenger Protection Regulations.
Canadian Transportation Agency (CTA) information
The Canadian Transportation Agency (CTA) serves as a dispute resolution authority over certain air transportation related issues. For more information or to log your complaint with the CTA’s Dispute Resolution Branch please consult the Canadian Transportation Agency.
For your protection's details, please refer to the information provided on your airline's website (Air Transat, Air Canada, WestJet, Air France, British Airways, American Airlines, Lufthansa, Delta Air Lines...).
For Air Transat : read this section