The Justice Department is examining the competitive effects of United Airline's acquisition of Continental, which would create the world's largest carrier.
The department routinely examines airline deals, which may affect services and prices for consumers.
Justice Department spokeswoman Gina Talamona said Monday that the department's antitrust division "is looking at the proposed transaction between these two airlines."
United has agreed to buy Continental in a $3 billion-plus deal, with the new United surpassing Delta Air Lines in size. It will fly to 370 destinations in 59 countries.
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