Published reports say Boeing's grounded 787 jetliners could soon be flying again.

The Wall Street Journal reports that the Federal Aviation Administration is set to approve Boeing's fix for the ion-lithium batteries. The 787 Dreamliner has been grounded since mid-January because of smoldering batteries that in one case caused a serious fire.

The Journal says the FAA is expected to announce Friday that Boeing's redesigned batteries are safe. The fix includes more heat insulation and a battery box designed to vent any hot gases from the batteries outside the planes.

There was no immediate comment from the FAA and a Boeing spokesman declined to comment on the report.

The New York Times, which also reported the development, says the aircraft could be back in service next month.