On Thursday, the US Federal Aviation Administration issued a formal "air worthiness" directive allowing revamped 787s to fly.
Later on Wednesday, the US Federal Aviation Administration (FAA) said that airlines must demonstrate battery safety before flights can resume.
Boeing is expected to offer ways to fix the 787's battery problems at a meeting with the US Federal Aviation Administration on Friday.
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.
Two weeks ago the US Federal Aviation Administration said both batteries had leaked electrolyte fluid, and there had been smoke damage to parts of the aircraft.
Despite this, he said, publicity about the talk had led the European Aviation and Safety Agency (EASA) and the US Federal Aviation Administration to get in touch seeking more details.
And with an estimated 1.3 billion people flying out of US airports each year by 2032, according to the US Federal Aviation Administration, that adds up to a lot of airport congestion.
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
No one was seriously injured in any of the events, and the National Transportation Safety Board, an independent federal agency charged with investigating civil aviation accidents in the US, and the Federal Aviation Administration, the national aviation authority of the US, have ordered investigations into the incidents.
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
The Federal Aviation Administration referred CNN to US Airways.
CNN: Passengers report scare on earlier US Airways Flight 1549
Also, there is no US government agency that regulates cruise ships, like the Federal Aviation Administration and the Department of Transportation which regulate air and land travel.
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.
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