By the next day, All Nippon and Japan Airlines -- the world's two largest Dreamliner operators -- had already begun installing modified lithium ion batteries on their 787 jets.
According to a report in the New York Times, the two airlines operating the largest number of 787 Dreamliners, All Nippon Airways and Japan Airlines, had experienced battery problems before the two incidents that caused the grounding.
The Japanese transport ministry said All Nippon Airways and Japan Airlines, the world's two largest Dreamliner operators, have already begun installing modified lithium ion batteries on their 787 jets.
Japan's two biggest airlines, Japan Airlines Systems Corp and All Nippon Airways Co Ltd, have expressed interest in a shorter-range model and are considered strong candidates for launch orders.
Boeing has backed the battery used in the Dreamliner after Japan Airlines and All Nippon Airways said they changed a number of them in the past few months.
As a fleet-wide grounding enters its third week, the battery failures on 787s flown by Japan Airlines and All Nippon Airways eariler this month remain under investigation by the US National Transportation Safety Board.
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International regulators grounded all 787 Dreamliners in January so that safety checks could be carried out on their batteries after incidents on a Japan Airlines plane and an All Nippon Airways plane.
The incidents on the Japan Airlines (JAL) and All Nippon Airways (ANA) planes prompted authorities in both the US and Japan to launch inquiries to try to find out what caused the battery problems.
All Nippon Airways owns 17 of the jets and Japan Airlines has seven.
The A350 is intended as a rival to the Dreamliner, which was grounded last month after a lithium-ion battery on a Japan Airlines plane caught fire, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
The carrier, along with Japan Airlines, discovered problems with the batteries, leading to all 787s in service worldwide being grounded in January.
The Dreamliners were grounded after a battery in a Japan Airlines 787 plane caught fire in Boston, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction earlier this month.
The 50 Dreamliners in service have been grounded since 16 January, after a battery in a Japan Airlines 787 plane caught fire in Boston, and an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
On Wednesday, All Nippon Airways said it had replaced batteries 10 times over the past few months, while Japan Airlines said it had done so in a "few cases" over the past few months.
American Airlines, Air China, Nippon Airways, Norwegian Air, and Japan Air have all affirmed they have no plans to cancel deliveries.
FORBES: Boeing In A Race Against Time As Entire 787 Dreamliner Fleet Grounded On Battery Issue
Last month, safety regulators grounded the entire fleet of Boeing 787 Dreamliners after a battery on a plane operated by Japan Airlines caught fire, while a battery malfunction forced an emergency landing of a flight operated by All Nippon Airways.
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