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The union representing 10,000 striking Air Canada flight attendants said Sunday it will challenge an order for them to return to work, adding "we remain on strike."

The Canada Industrial Relations Board ordered airline staff back by 2 p.m. ET Sunday after the government intervened and Air Canada said it planned to resume flights Sunday evening.

"We will be challenging this blatantly unconstitutional order," the CUPE union said in a statement. "We remain on strike. We demand a fair, negotiated contract and to be compensated for all hours worked."

The strike has stranded more than 100,000 travelers around the world during the peak summer travel season.

The country's largest airline said early Sunday in a

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