Boeing said it sees commercial flights of its grounded 787 jets resuming "within weeks" even though it has not pinpointed the cause of battery overheating.
Japan's All Nippon Airways said it repeatedly replaced the lithium-ion batteries in its now-grounded 787 Dreamliners even before overheating problems surfaced.
Japanese officials will inspect Kanto Aircraft Instrument, which makes a system that monitors voltage, charging and temperature of the lithium-ion batteries.