The Dreamliner, with passengers, has finally landed. United Airlines landed its inaugural domestic flight of the Boeing 787 Dreamliner aircraft Sunday morning at Chicago’s O’Hare International Airport, becoming the first U.S. carrier to fly the composite-plastic-fuselage aircraft. The twin-aisle plane, delayed more than three years by production problems at Boeing Co., was designed to be about 20% more fuel efficient and less costly to maintain than similar-size planes. Half the plane is made of strong and light composite materials, including the fuselage and wings, instead of metal. …