europeforvisitors - 3:13 pm on Aug 19, 2007 (gmt 0)

Something else to consider:

According to Google's explanation of its policy on trademarks in ads outside North America, a phrase like "Nike shoes" may trigger an ad for a competitive product or a merchant because the advertiser has bought the keyword "shoes." This may give the wrong impression that the trademarked keyword ("Nike") triggered the ad. The same thing obviously could be happening with searches for "[American] airlines."