A MODIFIED Dreamliner took to the skies over Tokyo with top Boeing and ANA executives aboard, as the planemaker and its leading client sought to reassure passengers the jetliners are safe. It was the first flight by one of All Nippon Airways' 787s since the worldwide fleet of the next-generation planes was grounded over safety concerns due to faulty batteries sparking fires on board two planes. The test flight by ANA, which has the largest fleet of Dreamliners, came a day after Ethiopian Airlines became the first carrier to resume flying the 787s. After a two-hour test flight from Tokyo's Haneda airport, ANA chairman Shinichiro Ito and Boeing Commercial Airplanes CEO Ray Conner descended the stairs of the Dreamliner. "After three months it's a terrific feeling to have an ANA 787 back in the air, and I am very pleased to say that it was a perfect flight on a perfect day," Conner told reporters. As is evident by the fact that we are here today, we are very confident in the solution that we developed. The US Federal Aviation Administration (FAA) and other regulators grounded the worldwide Dreamliner fleet in January after failures of the lithium-ion batteries on the jetliner caused a fire on board one parked plane in Boston and forced the emergency landing of an ANA-operated aircraft in Japan. Following months of investigations, the FAA on Thursday issued formal approval of Boeing's battery fix. ANA and Boeing are anxious to put the damaging crisis behind them but it could still be at least a month before the carrier can complete all the battery fixes and get its planes in the air. The company is expected to start flying the aircraft again in May, building up to normal flights from June 1. Neither Ito nor Conner commented on details of compensation, which ANA has said it will seek after months of cancellations and disruption to schedules. Although the exact cause of the battery failures has yet to be pinpointed, Sinnett insisted that the refitted planes were safe to fly.