787 Makes Emergency Landing in Japan, Dreamliners Grounded

Not the first incident involving the beleagured Boeing model

Japan's two leading airlines grounded their fleets of Boeing 787s on Wednesday after one of the Dreamliner passenger jets made an emergency landing, the latest in a series of incidents to heighten safety concerns over a plane many see as the future of commercial aviation.

Shares in the Chicago-based Boeing Co. were down 4.4 percent in premarket trading on the news.