The Justice Department is probing whether airlines colluded to keep fares high by growing at a slower pace, according to an Associated Press report citing a document and a spokeswoman. The report quoted the agency's spokeswoman, Emily Pierce, as saying the government was looking into "unlawful coordination." Though she didn't identify which companies were being probed, American Airlines , Delta Air Lines , Southwest Airlines and United Airlines control more than 80% of the seats for U.S. flights.
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