It may trail the historic impact of Charles Lindbergh's 1927 solo flight across the Atlantic, but the Spirit of St. Louis also did not have a wingspan wider than a football field or space for more than 500 passengers. For plane builder Airbus and German airline Lufthansa AG, the A380's first flight to North America on Monday is a chance to show off the superjumbo to potential U.S. buyers and to the airports they hope will be flight bases for the double-decker jet. "We're talking about an airplane that is representing aviation in the 21st century in terms of efficiency,"...