With the arrival of Southwest Airlines, Boston's Logan International Airport -- once a bastion of high prices -- will be home to at least six discount airlines. "Logan's transformation coincides with a major shift in the airline industry," writes Wall Street Journal columnist Scott McCartney, noting that discounters have largely abandoned their strategy of focusing on secondary airports. "Twenty years ago, the low-fare carrier side of the market was a niche," says a Southwest executive. "Today, the airline industry is a low-fare industry."
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