MONTREAL >> Air Canada flight attendants said on Sunday they would remain on strike despite a government-backed labor board’s order to return to work by 2 p.m. ET (1800 GMT), calling the order unconstitutional.

The Canadian Union of Public Employees said in a statement that members would remain on strike and invited Air Canada back to the table to “negotiate a fair deal.” The airline said it would delay plans to restart operations from Sunday until Monday evening.

On Saturday, the Canadian government under Prime Minister Mark Carney moved to end a strike by more than 10,000 flight attendants at the country’s largest carrier by asking the Canada Industrial Relations Board to order binding arbitration. The CIRB issued the order, which Air Canada had sought, and unionized flight attendants

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