Boeing is speeding up production of the Boeing Dreamliner, which was grounded earlier this year due a battery problem.
The Federal Aviation Administration ordered the grounding of all Dreamliners in January due to a problem with overheating lithium batteries on some of its flights. Boeing and the FAA announced a fix for the battery problem last month.
Boeing has been working to retrofit the 50 Dreamliners it delivered before the grounding with the battery fix since then.
Japanese airline ANA, the largest customer for the Dreamliner with 17 of the planes already delivered, announced Thursday that it plans to return its fleet of Dreamliners to service on June 1. Some other Dreamliner customers, including Qatar Airlines, have already started flying the plane again.
During the grounding, Boeing continued to build Dreamliners at a pace of five a month, as shutting or even slowing the production line was seen as too costly to both the company and its supplier base. None of the Dreamliners built during the shutdown have been delivered to customers yet.
Boeing had always anticipated upping production to seven planes a month by the middle of this year, on its way to meeting a target of 10 planes a month by the end of the year.
Customer demand for the Dreamliner has remained strong, despite the grounding. Its lightweight design -- using composite material rather than aluminum, and wires instead of some of the hydraulics -- allows it to be far more fuel efficient than earlier models. Fuel is the most expensive cost for most airlines.
Boeing has more than 800 unfilled orders for the Dreamliner.
Shares of Boeing (Fortune 500) were up following Thursday's announcement. ,
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