A aircraft symbol indicates the way to a departure gate during a test day ahead of opening at Heathrow airport's new Terminal 2 facility in London, U.K., on Wednesday, April 30, 2014. London Heathrow airport's new 2.5 billion-pound ($4.2 billion) Terminal 2 will limit passenger numbers to 2,500 or 10 percent of capacity when operations start on June 4 to avoid the havoc of the hub's last major opening. Photographer: Chris Ratcliffe/Bloomberg via Getty Images
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