The Department of Justice has begun an investigation into domestic airlines for collusion, the AP reports this afternoon. According to the report, the feds want to know whether the airlines worked together to slow growth across the industry so they could keep flights full and ticket prices high.

The AP says consolidation within the industry has raised some red flags with the federal government's investigators:

As a result of a series of mergers starting in 2008, American Airlines, Delta Air Lines, Southwest Airlines and United Airlines now control more than 80 percent of the seats in US skies. They have eliminated unprofitable flights, filled a higher percentage of seats on planes and worked to slow growth in order to command higher airfares.

Source: AP

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