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Prince William of Gloucester (1941 - 1972) in the cockpit of an aircraft during the European gliding competition at Dunstable Downs, Bedfordshire, 19th August 1972. He was killed a few days later when his aircraft crashed near Wolverhampton, at the start of the Goodyear Air Race. (Photo by Brian Harris/Fox Photos/Getty Images)

Prince William of Gloucester (1941 - 1972) in the cockpit of an aircraft during the European gliding competition at Dunstable Downs, Bedfordshire, 19th August 1972. He was killed a few days later when his aircraft crashed near Wolverhampton, at the start of the Goodyear Air Race. (Photo by Brian Harris/Fox Photos/Getty Images)