| Description: |
Airfares rise and fall in ways that are impossible to predict -- until now, according to a company called Farecast. Its crystal ball is historical airfare data -- some 150 billion (and counting) "airfare observations" -- that the company uses to deduce whether prices will go up or down on a particular route. Farecast is just one of several Web sites taking aim at answering the age-old travel question of when you should buy an airline ticket. We tested the sites over the course of several weeks to answer an equally important question: Can they actually do what they promise?
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