Four Airlines -- American Airlines, United, Delta and Southwest, Controls 80 Percent of the U.S. Market.

Alaska Air and JetBlue Seek to Buy Branson's Virgin America - Bloomberg: The real story in this article is "Four operators -- American Airlines Group Inc., United Continental Holdings Inc., Delta Air Lines Inc. and Southwest Airlines Co. -- now control 80 percent of the U.S. market. A second tier includes JetBlue, Alaska and Virgin America, plus a group of ultra-discounters, such as Spirit Airlines Inc."

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