TORONTO (AP) — The union representing 10,000 striking Air Canada flight attendants said Sunday it will defy an order to return to work and continue a strike that has stranded more than 100,000 travelers around the world during the peak summer travel season.

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

“Our members are not going back to work,” Canadian Union of Public Employees national president Mark Hancock said outside the Toronto Airport. “We are saying no.”

Hancock said the “whole process has been unfair" and said it will challenge what it called an unconstitutional order.

“Air Canada has really refused to bargain with us and they refused

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