Air Canada suspended plans to restart operations Sunday after the union representing 10,000 flight attendants said it will defy a return to work order.

More than 10,000 Air Canada flight attendants will continue their strike despite back-to-work orders from the Canadian government, the Air Canada component of the Canadian Union of Public Employees said Sunday.

Canada’s largest airline now says it will resume flights Monday evening. Air Canada said in a statement that the union 'illegally directed its flight attendant members to defy a direction from the Canadian Industrial Relations Board.