I thought there was an earlier thread on this but couldn't find it.

I was looking at a few fares today. After poking around and trying different times, I noticed that a RT that I thought was priced a few moments earlier at $275 had increased to $360. Hmm. So I deleted my cookies and cache for the last hour and voila! The $275 fare was back.

I thought the airlines had tried this trick of upping fares by tracking cookies before and stopped because of the bad publicity.