The Air Line Pilots' Association of Japan on Monday urged Boeing Co. to disclose more information on how the U.S. aviation giant dealt with the 787 Dreamliner's battery problems.

The association said that it has no access to detailed information on the remedies nor on the progress being made with the investigation into what caused the combustion problems. It said that the safety of the advanced aircraft should be examined more carefully.

"Frankly, we do not have enough information that enables us to declare whether we are for or against the resumption" of 787 flights, Hiroaki Tateno, president of the association and a captain at Japan Airlines Co., said at a press conference in Tokyo.