Striking Air Canada flight attendants vowed Monday to defy another back-to-work order from the country's labor tribunal, but resumed talks seeking to end a walkout that has cancelled travel for half a million people worldwide.

The union for 10,000 striking Air Canada flight attendants said Monday they won’t return to work even though the strike, now in its third day, has been declared illegal.

The union allowed a second return-to-work order from the Canadian government to expire on Monday, halting the airline's operations for a third day.