Boeing's troubles with its newest airplane got worse after an emergency landing prompted Japan's two biggest airlines to ground all their 787s for safety checks.
In this latest incident involving a 787, All Nippon Airways says the plane's main battery had burn marks around it, and its flammable liquid had leaked. The battery is below the cockpit. Pilots made an emergency landing after smelling something burning, and after a cockpit message showed battery problems.
Last week a battery burned on a Japan Airlines plane parked in Boston.
The two Japanese airlines together fly 24 of the 50 787s Boeing has delivered to customers.
Boeing says it is working with the airlines and regulators.