http://www.nytimes.com/2007/08/18/technology/18google.html

   American Airlines said on Friday that it sued the Internet search leader Google, accusing it of selling search words involving American’s name.

The claim is the latest in a string of cases filed by businesses that argue that Google’s pay-per-click advertising system, its main source of revenue, is used unfairly by competitors to grab business.

Google has prevailed in at least two similar cases in the United States, including a lawsuit brought by Geico, the auto insurer, but it still faces trial in California this year in a case brought by American Blind and Wallpaper Factory, as well as overseas claims.

The American Airlines lawsuit, filed on Thursday in Federal District Court for the Northern District of Texas, accuses Google of violating trademark laws with its practice of selling search terms such as “American Airlines” or “AA.com” to other companies for advertising.

Something similar was found a few days ago:
http://blogoscoped.com/forum/105722.html