Airline stocks haven't traditionally been a great investment, and they've attracted criticism from no less than Warren Buffett in the past. However, if you are willing to keep an open mind and share my view that something fundamental has changed in the industry, then Delta Air Lines (DAL -0.09%) is a great stock to buy. Here are 10 reasons why.1. Growth in premium revenueThe traditional view of the airline industry is one of highly cyclical booms and busts, where booms lead to overcapacity, which in turn le ...