A labor relations board declared a strike by Air Canada’s 10,000 flight attendants illegal on Monday and ordered their union to tell them to return to work by midday.

While Air Canada flight attendants continue to strike through the weekend, some travellers are in limbo at the Edmonton International Airport waiting for their flights to get rebooked.

A statement from the Canadian Labour Congress late Sunday evening said the “heads of Canada’s unions” met in an emergency session to stand behind Air Canada’s flight attendants.