It could be another chaotic day for travellers as a labour dispute continues between Air Canada and the union representing its flight attendants.

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 more than 10,000 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, saying she was intervening in the dispute because of its impact on Canadians and the economy.

On Sunday, CUPE held

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