The New York Times reports:

"A company controlled by Google’s top executives, including its billionaire founders, Larry Page and Sergey Brin, appears to have added a new plane to its well-equipped fleet: a fighter jet, or more precisely a Dornier Alpha Jet. According to Wikipedia, the Alpha Jet is a a light jet attack and advanced trainer aircraft manufactured by Dornier of Germany and Dassault-Breguet of France."

http://bits.blogs.nytimes.com/2008/10/23/a-new-fighter-jet-for-googles-founders/