The U.S. Federal Aviation Administration has ordered the temporary grounding of Boeing Co.'s technologically advanced new 787 Dreamliner jets to allow for a safety check of the plane's lithium batteries. The FAA said Wednesday it will issue an emergency safety order requiring airlines to temporarily cease operating the 787. United Airlines is currently the only U.S. carrier operating 787s. It has six. Boeing said it was working with investigators to resolve the issue. "We are confident the 787 is safe, and we stand behind its overall integrity," Boeing CEO Jim McNerney said late Wednesday in a statement. The grounding follows a move by Japan's two largest airlines, which grounded their fleets of 787 Dreamliner jets earlier Wednesday after one was forced to make an emergency landing. All Nippon Airways has grounded its fleet of 17 Dreamliners after a cockpit message showed battery problems and a burning smell was detected in the cockpit and the cabin, forcing the 787 on a domestic flight to land at Takamatsu airport in western Japan. That incident came several days after a pair of events at U.S. airports where the planes had a burning smell in the cabin and a fuel leak on the tarmac. A Japan Airlines plane leaked fuel on the tarmac at Narita airport, after landing a flight from Boston, where it also leaked fuel. After the second incident, JAL grounded the plane indefinitely while authorities investigate. The Dreamliner is Boeing's most high-profile plane offering in the past several decades. Pitched as the most efficient people mover and environmentally conscious plane on earth, the plane has been plagued by delays and cost overruns since it was first announced. "Boeing is aware of the diversion of a 787 operated by ANA to Takamatsu in western Japan. We will be working with our customer and the appropriate regulatory agencies."—Boeing spokesman Marc Birtel The two Japanese carriers are among the first airlines in the world to use the planes in their fleets. Together, they own just over half of all 787s that are currently flying, which means 50 per cent of the planes are grounded indefinitely. Air Canada declined to comment to CBC News for the story, but the