Boeing Company conducted its first test flight of its Dreamliner aircraft with modified lithium-ion batteries, two months after all of its newest jets were grounded. The Dreamliner spent two hours in the air Monday after taking off from Everett, Washington, and all went according to plan, the US aircraft maker was quoted as saying by DPA. The US airline regulator, the Federal Aviation Administration, must approve the changes Boeing is making to the batteries before it may return to commercial flights. Data from Monday's flight must be evaluated and then the approval process could begin, a Boeing spokesman said.