Striking Air Canada flight attendants vowed Monday to defy another back-to-work order from Canada's labor tribunal, extending a work stoppage that has cancelled travel for half a million people worldwide.

Roughly 10,000 flight attendants walked off the job after midnight Saturday, insisting the airline had failed to address their demands for higher wages and compensation for unpaid ground work, including during boarding.

Canada's national carrier, which flies directly to 180 cities domestically and abroad, said the strike had forced cancellations impacting 500,000 people.

Over the weekend, federal labor minister Patty Hajdu invoked a legal provision to halt the strike and force both sides into binding arbitration.

Following Hajdu's intervention, the Canada Industrial Relations Board (C

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