KAMPALA, Uganda (AP) - A Boeing 787 operated by Ethiopian Airlines flew from Ethiopia to Kenya's capital on Saturday, the first commercial flight since air safety authorities grounded the Dreamliners after incidents with smoldering batteries on two different planes in January.

The Boeing 787 passenger jet arrived in Nairobi on Saturday afternoon after a two-hour trip from Ethiopia's capital, Addis Ababa, according to the Kenya airport website.

The US Federal Aviation Administration has approved Boeing's redesigned battery system, which the company says sharply reduces the risk of fire.

Mr Richard Horigan, a Boeing engineer, told reporters in Nairobi this week that all potential causes of battery fire have been eliminated with the new system. But he noted that the root cause of smoldering batteries experienced by the two different 787s may never be known because the evidence was destroyed by heat.

There are 50 Dreamliners in service around the world. Once the FAA approves the fix on individual planes, airlines can start flying them again.

Boeing said on Wednesday that deliveries of the 787 should resume in early May.