TOKYO--Japan's transport ministry Friday said it is planning to lift the order grounding Boeing Co.'s (BA) Dreamliner 787 flights by Japanese airlines, following an expected decision by its U.S. counterpart to do the same.

The ministry's decision will effectively allow the return to service of the bulk of the global Dreamliner fleet, more than three months after burning batteries on two Japanese planes prompted regulators to halt all flights. Japan's two big airlines, All Nippon Airways and Japan Airlines Co. (9201.TO), together operate 24 of the 50 Dreamliner jets in operation.

The formal decision will come following an official sign-off on flights by the U.S. Federal Aviation Administration, expected later Friday, U.S. time.

Still, the two carriers aren't expected to start flying their 787 jets commercially until around June, as the airlines conduct test flights and mull measures to ensure passengers feel safe on the planes. The two Japanese airlines Monday began work to install modified batteries on their 787 planes with Boeing's engineers following the approval by the FAA last Friday on fixes to the batteries.

JAL has said it expects to take several weeks to finish the fixes on its seven Dreamliners. ANA estimates that work on its 17 Boeing 787s will be completed by the end of May, a person with knowledge of the 787 operations, has said.

"We can't just tell our customers to fly on the planes as soon as we're finished fixing them," Osamu Shinobe said in a recent interview. Mr. Shinobe is the newly appointed chief executive of All Nippon Airways, which now operates under recently established ANA Holdings Inc. (9202.TO).

Ethiopian Airlines (EAIR.YY) is reportedly set to be the world's first carrier to resume the 787 commercial flights, starting on Saturday.

While Japanese carriers are rushing to win customers back, they will start negotiations with Boeing on compensation stemming from the grounding.

JAL estimated that the grounding would cut operating profit by 700 million yen ($7 million) in the fiscal year ended March. ANA said that the suspension resulted in a loss of Y1.4 billion in revenue in January.

The two airlines are scheduled to report their earnings on Tuesday.

Write to Yoshio Takahashi at yoshio.takahashi@dowjones.com

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