Air Canada CEO Michael Rousseau will retire by October, the airline said on Monday, after he sparked a backlash for failing to offer condolences in French, one of Canada's two official languages, over a crash that killed two pilots.

Prime Minister Mark Carney last week said Rousseau had shown a lack of judgment by releasing only an English video after an Air Canada Express jet collided with a fire truck at New York's LaGuardia Airport over the weekend. Rousseau later issued an apology for the lapse.

Language remains a sensitive issue in mostly French-speaking Quebec, the country's second-most-populous province, where unhappiness over the dominance of English helped the rise of the separatist Parti Quebecois in the 1970s.

The airline said it was accelerating a plan to replace Rousseau, 68, who will leave by the end of the third quarter. It said candidates to replace him would be judged in part on their ability to speak in French.

Rousseau took over as CEO in February 2021 and helped Air Canada recover after the COVID-19 pandemic, while apologizing at the time for his poor French. He also faced criticism for his handling of a four-day strike by flight attendants last year.

Air Canada shares fell more than 2% on the Toronto stock exchange.

Federal Transport Minister Steven MacKinnon issued a short statement thanking Rousseau for his contributions to Air Canada, adding that the government would make sure the airline offered a bilingual service.

While Air Canada is a publicly traded company, it is required to provide services in both English and French under the Official Languages Act, which guarantees the public's right to communicate with the company in either language.

Quebec's provincial legislature last week adopted a non-binding motion calling on Rousseau to quit over what lawmakers called his lack of respect for the French language.

An election for the Quebec legislature will be held by October and polls indicate the Parti Quebecois, which wants to break away from Canada, will win most seats.

In 2021, Rousseau apologized and pledged to improve his French after then-Prime Minister Justin Trudeau criticized him for giving a speech almost entirely in English in Montreal, where the airline is headquartered.

Airline CEOs are increasingly expected to address the public following fatal accidents involving their aircraft.