Red Bull two seater bi-plane
Photo of the two seater biplane, owned by Red Bull, registration OE-AMM. It is a well maintained Stearman Kaydet (Boeing E75). A staggering 8584 were built in the US as military trainer aircraft during the 1930s and 1940s.
After the second WW you could find plenty of them in service as crop dusters and as sports planes. I remember a few movies with the Stearman in it :)
Photo by Keith Philpott, text by Marcel Gommers
Picture added on 11 November 2008