After investigating a fire that broke out on Boeing Co.’s 787 Dreamliner passenger jet, the National Transportation Safety Board says that backup protections in the aircraft’s lithium-ion batteries and electronics systems failed, the New York Times reports. Air-safety experts said the FAA isn’t likely to lift its order grounding the 787 quickly, given the NTSB’s lack of progress toward finding the root cause of the battery problems, the Seattle Times reports.