boeing's 747-8 intercontinental made its first-ever landing in seattle on sunday.  its boeing's longest,                 fastest, and in theory, most fuel- and cost-efficient ever.  boeing plans on conducting about 600 hours of flight testing to reach certification throughout the summer and fall

the 747 -8 intercontinental will carry about 467 passengers in a three-class configuration, and cost around $300 million to build