A Quebec Court of Appeal has upheld a Quebec Superior Court's ruling which found Air Canada (AC, Montréal Trudeau) guilty of contravening federal laws that require the carrier to perform heavy MRO operations in the province's largest city, Montreal.

Aveos Fleet Performance (formerly Air Canada Technical Services) had undertaken heavy MRO works for and on behalf of former parent Air Canada until early 2012 when airline management withdrew all business from its former subsidiary. At the time, management blamed Aveos's uncompetitive pricing for the move. Burdened with unsustainable debt, Aveos was then forced to file for bankruptcy resulting in the loss of 2,600 jobs including 1,700 in Montreal.

However, in 2012, the province of Quebec took Air Canada to court claiming the airline had violated the Air Canada Public Participation Act which requires it to carry out heavy MRO in Montreal and Winnipeg, along with Mississauga, Ont. In February 2013, the Superior Court issued its ruling in favour of the plaintiff which Air Canada subsequently appealed.