About 20 people have been injured by turbulence aboard a United Airlines plane flying from Washington, D.C., to Japan. United Airlines spokesman Mike Trevino in Chicago said about halfway into the 13-hour flight, the pilot advised passengers to put on their seat belts. A short time later, the plane "experienced moderate turbulence." He declined to discuss any injuries but said United is cooperating with health officials. The Boeing 747 with 263 people on board landed on schedule Saturday in Tokyo.
