This is part four of Hyperbola's series of podcasts that will in total make up the 45min interview with Virgin Galactic president Will Whitehorn held on 4 March 2009 in the company's London offices. During this 7min 21s interview hear Whitehorn talk about the importance of the Experimental Aircraft Association's AirVenture event in Oshkosh, Wisconsin, the rate of ticket sales, putting travel agents through centrifuges, US regulations and more