Is there a good Airfare tracking site?

[twinklebug]

I thought I had seen a site in the past that tracked historic airfare on the airlines, including SWA and told us from historic trends when the best time to buy might be. It looks like Google now might own that site and it isn't even a shadow of what it used to be.

 

[Shelly F - Ohio]

airfarewatchdog.com

 

[I loveStitchnippyjon]

I have had good luck using airfarewatchdog.com and yapta.com.