CHARLOTTE (TheStreet) -- For years, airline analysts have been proclaiming that this time it's different, that airlines have finally become viable investments. In the first quarter of 2013, it all seems to be coming true. So far this year, the Arca Airline Index is up 23%. Spirit shares are up 37%, Alaska is up 35% and Delta is up 34%. United shares have risen 29%. They all lead the S&P 500, which up about 10% this year. Hawaiian , down 4%, is the only major airline to show a decline. US Airways is up only 18%, but that can be excused because its shares rose 159% in 2012. ... ... Read More