Air Canada says the Canada Industrial Relations Board has declared the strike by the company’s 10,000 flight attendants illegal and has ordered the union’s leadership to direct its members to return to work.

It could be another chaotic day for travellers as the dispute continues. Flight attendants with the Montreal-based airline represented by the Canadian Union of Public Employees are expected to remain on the picket lines today as a battle against a federal return-to-work order continues.

CUPE says it filed a challenge in Federal Court on Sunday against an order by the Canada Industrial Relations Board that said flight attendants had to return to work as of 2 p.m. ET that afternoon.

That order came after Jobs Minister Patty Hajdu sent both parties to binding arbitration on Saturday, s

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