Columnist Lily J. Kosner outlines the valuable services travel agents provide. "[I]f you are booking a complicated itinerary or traveling with a large group, not only will a travel agent handle all of the logistics so nothing goes wrong, but often they have the relationships to be sure that you get the best rate," she writes. In 2012, travel agents sold $86 billion in air travel, which accounts for nearly two-thirds of the market.

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