The U.S. Federal Aviation Administration (FAA) said Friday it was reviewing a proposal by Boeing aimed at returning the 787 Dreamliner to the air, but said it would not allow it until the agency was confident that risks with the airplane's batteries have been addressed. Deputy Transportation Secretary John Porcari, FAA Administrator Michael Huerta, and other officials met with senior Boeing executives to discuss the status of ongoing work to address 787 battery issues, FAA spokeswoman Laura Brown said. The FAA grounded the entire fleet of 50 787s on January 16 after the lithium ion batteries on two separate planes failed. Boeing called Friday's meeting productive and was encouraged by progress being made toward returning the fleet to service.