Boeing's transonic wind tunnel in Seattle is the site for high-speed tests of the company's 777X that began last week. The tests are designed to evaluate cruise performance and complement lower-speed testing that started in the U.K. last month. Future tests will focus on noise, icing and propulsion. "Data from these tests will allow us to validate our airplane cruise performance models in support of our ongoing design efforts," said Terry Beezhold, vice president and chief project engineer of the 777X project.

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