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.

Air Canada flight attendants continued their strike Monday after an order to return to work by the Canadian government. The union has defied the order.

Mark Hancock, National President of the Canadian Union of Public Employees (CUPE) which represents striking Air Canada flight attendants, speaks at a news conference in the hotel media room at Toronto Pearson International Airport in Mississauga, Ontario, Canada, August 18, 2025. REUTERS/Wa Lone