Special discounted deals and airfare sales from Air Canada. Air Canada is Canada’s largest airline and the largest provider of scheduled passenger services in the Canadian market, the Canada-U.S. transborder market and in the international market to and from Canada. Air Canada is among the 20 largest airlines in the world and employs 30,000 people. Its corporate headquarters are located in Montreal. Find the latest airline travel discounts and cheap airfare tickets to airlines flying to and from the gay city of Puerto Vallarta, Mexico.