ANA, which has 17 Dreamliner jets, has not said how much the grounding has cost the company, though it has said it was losing $868,300 in revenue per plane in the last two weeks of January.
ANA will renew compensation talks with Boeing after it resumes commercial flights and is able to calculate total losses, the company said.
In addition to the battery fix approved by U.S. authorities, Japan’s Civil Aviation Bureau has requested airlines meet the country’s own safety standards when flying the 787, which include monitoring the battery current while the jet is in the air and checking used batteries.
Teams of Boeing engineers began installing reinforced batteries on Dreamliners owned by ANA on Monday. The airline hopes to complete retrofitting its entire fleet by mid-May.