SEATTLE (AP) -- Boeing is conducting another test flight of its 787 passenger jet over the West Coast.
The company said Monday's flight is designed to test system upgrades and not to certify changes in the plane's batteries.
Airlines have 50 of the planes, which Boeing calls the Dreamliner. But they're still grounded after two of them overheated. Boeing is trying to assure regulators that after some design changes, the batteries are safe. Boeing expects to make at least one battery-test flight.
After Monday's 2-hour flight from the Seattle area to Moses Lake, Wash., Boeing plans to fly the test plane back to Seattle.