Porter Airlines is a regional airline headquartered at Billy Bishop Toronto City Airport on the Toronto Islands in Toronto, Ontario, Canada. Owned by Porter Aviation Holdings, formerly known as REGCO Holdings Inc., Porter operates regularly scheduled flights between Toronto and locations in Canada and the United States using Canadian-built Bombardier Dash-8 Q 400 turboprop aircraft.

Porter's operation at the Toronto airport was launched in 2006 with some controversy. Robert J. Deluce, who is now the CEO of Porter Airlines, came up with the idea of creating a regional airline using Bombardier turboprop aircraft to major cities of Canada within the range of Toronto. A planned bridge to the airport was cancelled in 2003, leading to lawsuits between Deluce and the City of Toronto. The airline lost the case in court but the idea for the airline remained. With the compensation received from the Toronto Port Authority for the lawsuit, REGCO bought the island airport terminal used by Air Canada Jazz and terminated Air Canada's access. Porter has expanded its operations since 2006, adding more destinations and planes. Porter opened a new, larger passenger terminal at the island airport in March 2010. In 2013, Porter made a proposal to expand Toronto Island airport to allow jets. Toronto City Council reserved its support, requiring the controversial proposal be the focus of Ports Toronto studies. In November 2015, the federal government announced it would not support the proposal.

Porter Airlines along with Porter FBO Limited, which operates the Porter facilities at Billy Bishop, and City Centre Terminal Corp., are owned by Porter Aviation Holdings (PAHL), formerly known as REGCO Holdings Inc. The company was founded in 1999.

Porter Aviation Holdings Inc. is controlled by :

Source: Bloomberg Business Week

At startup, $125 million CAD was put into the airline including money from:

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