Pilots at Portugal‘s state-owned national airline have begun a 10-day strike, forcing flight cancellations as they press their demand to be given up to a 20 percent stake in the company when it is privatized later this year. TAP Air Portugal said it expected up to 3,000 flights and 300,000 passengers to be affected by the walkout that started Friday, causing losses of at least 30 million euros ($33.7 million).