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(NEWSER) – A 22-year-old who's made it easier for air travelers to buy cheaper plane tickets is now being sued by two heavyweights in the airline industry, reports the Daily Dot. United Airlines and partner Orbitz are going after Aktarer Zaman and his website

The site takes advantage of a trick called "hidden city" ticketing that generally results in cheaper fares: You buy a one-way ticket to a city that is supposed to be only a layover but is, in fact, your final destination.

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