FILE - In this Jan. 18, 2013 file photo, All Nippon Airways' Boeing 787 "the Dreamliner" passenger jets are parked on the tarmac at Haneda airport in Tokyo. Documents related to a feder

 

              FILE - In this Jan. 18, 2013 file photo, All Nippon Airways
FILE - In this Jan. 18, 2013 file photo, All Nippon Airways' Boeing 787 "the Dreamliner" passenger jets are parked on the tarmac at Haneda airport in Tokyo. Documents related to a federal investigation into a battery fire aboard a Boeing 787 show firefighters struggling to tame a small but worrisome blaze that has left investigators relieved that it happened after a flight and not during one. Another smoldering battery nine days later in Japan prompted the grounding of 787s worldwide. Investigators still don’t know the root cause. (AP Photo/Koji Sasahara, File)