Kayak (KYAK +2.7%) rallied today after CEO Steve Hafner declared on CNBC (video) that Google (NASDAQ:GOOG) isn't a threat to the travel search engine. "Google has had their flight search and hotel finder out in the market for two years ... it's an inferior product," Hafner asserts. Kayak and Google have a complex relationship: about a tenth of Kayak's traffic comes from Google queries, and the company relies on data from Google's ITA Software unit. Kayak opposed Google's purchase of ITA last year.