Japan's All Nippon Airways flew a Boeing 787 Dreamliner Sunday, more than three months after the entire worldwide fleet of 50 planes was grounded because of battery meltdowns.
The plane carried top executives from ANA and Boeing on a two-hour flight to test a new battery system and reassure customers that the planes are safe.
The test came a day after Ethiopian Airlines became the world's first carrier to resume flying the troubled plane.
The U.S. Federal Aviation Administration approved the new design earlier this month, clearing the way for other planes to return to service as soon as the upgraded systems are installed.
Japan's transport minister gave the official approval Friday for that country's airlines to resume flights once the changes are made.
Speaking to reporters in Tokyo Saturday, Boeing chief engineer and 787 project leader Michael Sinnett said the root cause of the battery faults had not been found, but a new enclosure for the updated batteries will keep the planes safe from fire in case the batteries meltdown.