The Northwood mid-air collision took place at on 4 July 1948 at 15:03 when a Douglas DC-6 of Scandinavian Airlines System (SAS) and a Avro York C.1 of the Royal Air Force (RAF) collided mid-air over Northwood in London, the United Kingdom. All thirty-nine people aboard both aircraft were killed. It was SAS's first fatal aviation accident and was at the time the deadliest civilian aviation accident in the UK. It is still the deadliest mid-air collision in British history.
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