A prototype flew in 1960. Various changes were made and several preliminary versions flew including the "Kestrel" and the first Harriers flew for the RAF and Royal Navy in 1969. The planes were built in both Britain and the United States. They were redeveloped and manufactured by British Aerospace and Macdonald Douglas, companies which are now owned by BAE Systems and Boeing, respectively. At present the Boeing/BAE Systems AV-8B Harrier II is used by NATO countries such as the United States, Spain and Italy. A modified version, the BAE Systems/Boeing Harrier II is used by the Royal Air Force and the Royal Navy.