NEW : Boston orders that 50 remain out of service until battery safety is assured . Dreamliners says the company is confident that the planes are safe . Boeing grounds FAA for battery fix . The move follows an emergency landing in Japan and another incident in Boston .
NEW : Japan orders that 787s remain out of service until battery safety is assured . Boeing says the company is confident that the planes are safe . FAA grounds Dreamliners for battery fix . The move follows an emergency landing in Japan and another incident in Boston .