Justice Department Investigating Airlines' High Fares

The investigation will examine possible collusion between United Airlines, Delta Air Lines, American Airlines and Southwest Airlines.
1:48 | 07/01/15

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Transcript for Justice Department Investigating Airlines' High Fares
attract sharks. Next to the airlines under investigation. The government asking are they working together to drive up airfares? These four airlines, American, delta, southwest and united, together control 80% of the seats on U.S. Flights. Anyone who has flown lately knows about high fares and added fees as well as crowded and uncomfortable cabins with more than 3 million Americans expected to fly this holiday weekend. Will they be paying more than they should. ABC's David Kerley who covers aviation for us with details on the investigation. Reporter: Planes are packed but is that because airlines are working together illegally to keep fares that you pay higher? Tonight the justice department saying it's investigating potential unlawful coordination by certain airlines after a call for an investigation by a U.S. Senator. Holding down supply, economics 101. That is a violation of law if it is misuse of market power. Reporter: United, delta, American and southwest which together control 80% of the market have been told to produce statements and decisions from the past two years about the size of their fleets. The theory is that the airlines may have been working together to keep those fleets the same size so that the airlines could keep fares up. The airlines through their association say they compete vigorously every day. If the definition of Kohl lugs that the airline exec tifs are calling each other up every day, there's no smoking gun there. David Kerley joining us now. Any sense of how long this investigation will take? Reporter: Senator Blumenthal who called for the investigation is also calling on the department of justice to move quickly. We're in the midst of this busy summer travel season. He wants relief for consumers as soon as possible, Amy. David, thanks so much.

This transcript has been automatically generated and may not be 100% accurate.

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