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All Nippon Airways said it would begin test flights of Boeing Co's 787 Dreamliner on Sunday after the Japanese government on Friday issued approval for the grounded aircraft to resume flight.
The company said it would retrain its Dreamliner pilots with 230 test flights.
The 50 Dreamliner jets in service worldwide were grounded in mid-January after incidents with smoldering batteries occurred aboard two different planes.
The groundings have led to hundreds of canceled flights and big revenue losses.
The U.S. Federal Aviation Administration posted a safety order online Thursday allowing 787 flights to resume once the batteries are replaced with a revamped system that manufacturer Boeing says sharply reduces the risk of fire.
Japan's two biggest airlines began installing revamped lithium ion batteries over the past week. All Nippon Airways owns 17 of the jets and Japan Airlines has seven.
Japan Airlines aims to return Dreamliner jets to commercial flights in June, the company said in a statement on Friday.
Reuters and The Associated Press contributed to this report.