Break them up - the airlines have become a monopoly.  There is no competition.  Things will only get worse: smaller seats, no advanced seat assignments, higher fares in small markets, more fees (for just about everything), decreasing pay and benefits for airline employees, overseas maintenance, just to name a few things.
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Graphic: "The runway to the final four: A series of bankruptcies and mergers over the last 12 years has taken what had been 10 major U.S. airlines down to four mega-carriers which dominate the market."

http://money.cnn.com/infographic/news/companies/airline-merger/