Air Canada flight attendants remained on strike on Sunday past the deadline in a government-backed labor board’s order to return to work , causing the country’s biggest airline to delay restarting operations.

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,” calling the order to end its strike unconstitutional.

The airline said it would delay plans to restart operations from Sunday until Monday evening. 5

On Saturday, Prime Minister Mark Carney’s Liberal government moved to end the strike by more than 10,000 flight attendants by asking the Canada Industrial Relations Board to order binding arbitration.

The CIRB issued the order, which Air Canada had sought, and uni

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