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Ask any veteran business traveler how to track down a cheapticket, and you may get an earful about hidden cities andback-to-back tickets.
For years, travel agents helped road warriors use these tricksto save money. But recently, airlines have begun charging retailersthe difference between regular fares and the amount saved. Thecarriers are going after travelers, too, using sophisticatedsoftware to track travel patterns through frequent-flieraccounts.
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