The directive from the US Federal Aviation Administration (FAA) means US airlines can begin using the planes again, provided their battery systems are replaced.
Japanese authorities said they would work with Boeing and the US Federal Aviation Administration (FAA), which launched an investigation in the US on Friday.
The FAA alleges US Airways operated the eight aircraft on a total of 1, 647 flights last fall and winter while the planes were in a potentially unsafe condition.
CNN: US Airways, United face FAA fines for safety violations
Robert Isom, head of operations at US Airways, said the FAA furloughs were like a "wildcat regulatory action".
Later on Wednesday, the US Federal Aviation Administration (FAA) said that airlines must demonstrate battery safety before flights can resume.
Fans of the 787 Dreamliner haven't had much reason to cheer for the past few weeks when the FAA grounded all US jets over concerns of battery failures.
After the incidents involving the JAL and All Nippon Airways planes, the US Federal Aviation Administration (FAA) said both the batteries had leaked electrolyte fluid and there had been smoke damage to parts of the aircraft.
BBC: Dreamliner: Japan's airlines say they changed batteries
On Friday, Boeing gave US regulator, the Federal Aviation Administration (FAA), its plan to fix the battery problems, which reportedly involves a significant redesign of the battery pack with new ceramic insulation around each of the battery's eight cells.
BBC: Dreamliner: Japan's ANA cancels more Boeing 787 flights
In a letter to its employees, US Airways Chief Operating Officer Robert Isom called the FAA announcement disappointing.
CNN: US Airways, United face FAA fines for safety violations
The Air Transport Association (ATA), the powerful industry group that represents the country's largest commercial airlines, such as Delta, US Airways and Continental Airlines, has given the FAA's proposal only a tepid reception.
"We're not working in partnership with the FAA, " said Robert Isom, chief operating officer at US Airways Group Inc.
However, with the number of US passengers set to rise to one billion per year by 2020, the Federal Aviation Administration (FAA) is planning a move to a new satellite-based system, called Next Generation Air Transportation System, or NextGen.
Let us hope for the sake of the poor that other bureaucracies are managing the modest sequester cuts more responsibly than the FAA. But the larger point is that from the beginning the FAA's delays were deliberate and avoidable.
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