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.

Air Canada flight attendants said on Sunday they will remain on strike and challenge a return-to-work order they called unconstitutional, defying a government decision to force them back to their duties by 2 p.

Canadian Union of Public Employees (CUPE) said staffers will continue to strike until fair negotiations take place.