Air Canada is the flag carrier and largest airline of Canada, operating an extensive domestic and international network. Founded in 1937 as Trans-Canada Air Lines, it was rebranded as Air Canada in 1965 and has grown into one of the top 20 largest airlines in the world by passengers carried. The airline operates scheduled passenger service to more than 200 destinations across six continents, serving tens of millions of passengers annually. It also runs a low-cost subsidiary, Air Canada Rouge, and a regional feeder operation under the Air Canada Express banner. Air Canada is a founding member of Star Alliance, the world's largest airline alliance, enabling seamless connections to hundreds of additional destinations through partner carriers. The airline is headquartered in Montreal and maintains its largest hub at Toronto Pearson International Airport.