Airfare tracking service Yapta said today it is partnering with travel search site Kayak to power its flight search engine. "By introducing Kayak's best-in-class flight search engine, Yapta members now have greater access to flight data and are able to track prices for virtually any flight in the world," said Tom Romary, president and CEO of Yapta . "Tracking airfare prices prior to purchase will help travelers save money 45 percent of the time.