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"The members of the union’s bargaining unit are directed to resume the performance of their duties immediately and to refrain from engaging in unlawful strike activities," Webster wrote in the decision.

Air Canada's flight attendants went on strike on Saturday but were ordered back to work after federal Jobs Minister Patty Hajdu invoked Section 107 of the Labour Code to ask the Canada Industrial Relations Board to send the two sides to binding arbitration and order an end to the job action.

However, the Canadian Union of Public Employees, which represents the flight attendants, has ignored the edict and challenged the CIRB order in Federal Court.

The order Monday came as picketers continued to march around the Terminal 1 departure doors at Toronto Pearson International Airport early Monday morning.

Chants reverberated through the sliding doors and into the airport terminal, where passengers approached Air Canada employees to ask about alternatives to their cancelled flights.

Air Canada had intended to restart flights on Sunday, but were prevented by the union's decision to continue its strike despite the CIRB order. The airline estimated Monday that some 500,000 customers’ flights have been cancelled as a result. 

Air Canada also suspended its financial guidance for the third quarter and its full year due to the labour disruption.

A statement from the Canadian Labour Congress late Sunday evening said the "heads of Canada's unions" met in an emergency session to stand behind Air Canada's flight attendants.

The group called Hajdu's intervention an "unconstitutional attack on workers’ rights" and said Canada's labour groups were unanimously calling on the federal government to withdraw its intervention.

The statement also said labour unions are ready to "co-ordinate a fight back campaign" and promote and co-ordinate financial contributions to assist with legal and other costs related to flight attendants' decision to defy Hajdu's order.

"The labour movement is united and standing firm, and we will not allow these Charter-protected rights to be trampled upon," the statement read. 

— With files from Natasha Baldin in Toronto

This report by °µÍø½ûÇø was first published Aug. 18, 2025.

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