Boeing has begun installing reinforced lithium ion batteries in some of its grounded Dreamliner planes.
The batteries in five jets owned by All Nippon Airways (ANA) are being replaced, and Japan Airlines is installing the equipment in two of its seven Dreamliners.
The process could see the first commercial 787s ready to fly again in about a week, according to Reuters.
All 50 Dreamliner planes were grounded by regulators in January following two battery fires - one in the US and another in Japan.
On Friday, the US' Federal Aviation Administration (FAA) approved Boeing's battery modification plans.
The aerospace giant will encase the new batteries in steel box, install new battery charges, and add a duct to vent gases directly outside the aircraft that could cause overheating.
ANA - the world's biggest operator of Dreamliners with 17 planes - plans to conduct between 100 and 200 test flights of the repaired aircraft in May, a source told Reuters.
The tests will check the planes' safety and allow ANA's 180 pilots to get accustomed to flying them again after more than a three-month break.
The operator could start carrying passengers again on board Dreamliners from June, Reuters reported.
ANA has not said how much the grounding has cost it to date, but has said it lost around $900,000 (£590,660) in revenue per plane in the last two weeks of January.
The grounding of the fleet is estimated to be costing Boeing $50m (£32.8m) a week, and airlines across the world that own the planes have also been hit.
US and Japanese investigators have yet to identify what caused the batteries onboard two jets to overheat.
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