Each year, 24/7 Wall St. identifies 10 important American brands that we predict will to disappear within a year. This year’s list reflects the brutally competitive nature of certain industries and the reason why companies cannot afford to fall behind in efficiency, innovation or financing. American Airlines will disappear in 2013 because of its inefficiency. It was the premier carrier in the United States for almost 30 years — even surviving through periods when most other carriers went bankrupt. However, it lost its critical advantage of scale when Northwest merged with Delta (NYSE: DAL) and Continental merged with United (NYSE:...