Air Canada flight attendants remained on strike Sunday, defying a government labor board’s order to return to work and forcing Canada’s largest airline to delay its restart plans.The walkout, which began shortly after 1 a.m. Saturday, grounded most of the carrier’s 700 daily flights and stranded more than 100,000 passengers.The airline had hoped to restart service Sunday evening, but scrapped those plans after the Canadian Union of Public Employees (CUPE) urged its members to defy a Canadian Industrial Relations Board (CIRB) order to return to work. "Approximately 240 flights scheduled to oper...

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