BLAGNAC, France - European aircraft maker Airbus SAS on Friday launched production of its A380 "superjumbo," the biggest ever commercial airliner, stepping up its challenge to U.S. rival Boeing Co. which has staked its future on a new mid-sized jet. During a ceremony attended by French Prime Minister Jean-Pierre Raffarin, Airbus unveiled the first fuselage at its new $435 million assembly plant near the southern city of Toulouse. The 545-acre site will receive sections of the plane built by Airbus workers in France, Germany, Britain and Spain and transported to Toulouse on specially constructed ships, river barges and trucks. The...