Farecast got bought by Microsoft and was used in Bing Travel, but it seems to be gone now. According to Wikipedia (http://en.wikipedia.org/wiki/Bing_Travel http

Farecast got bought by Microsoft and was used in Bing Travel, but it seems to be gone now. According to Wikipedia (http://en.wikipedia.org/wiki/Bing_Travel http://en.wikipedia.org/wiki/Bing_Travel), "As of January 2014, the fare prediction feature has been removed."