 has already been trying to strengthen safety measures. It announced today it's buying Spirit Aerosystems in a deal valued at about $8 billion. Boeing says the acquisition is, quote, in the best interest of the flying public. Spirit makes parts for Boeing planes, including a door-shaped panel that blew off an Alaska Airlines plane earlier this year. Neither Boeing nor the Justice Department responded to requests for comment on the plea deal. I'm Nancy Marshall-Genzer for Marketplace.