Air Canada flight attendants returned to the picket line on Sunday defying a government-backed labour board’s order to return to work.The Canadian Union of Public Employees said in a statement that members would remain on strike and invited Air Canada back to the bargaining table.

The union representing 10,000 Air Canada flight attendants said it will challenge an order to return to work and remain on strike.

A Canadian government panel ordered the flight attendants back to work, but they refused. The strike is affecting about 130,000 travelers around the world each day.