The union representing Air Canada flight attendants vowed to fight a federal order to end their strike , calling it "blatantly unconstitutional" and accusing the government of siding with the airline.

“We invite Air Canada back to the table to negotiate a fair deal, rather than relying on the federal government to do their dirty work for them when bargaining gets a little bit tough,” the union said in a statement Sunday.

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Earlier in the day, the Canadian Industrial Relations Board (CIRB) directed Air Canada and Air Canada Rouge flight attendants to "resume their duties” by 2 p.m. ET, the airline said in a statement.

The directive came after Jobs Minister Patty Hajdu moved to impose binding arbitration Saturda

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