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In page Croydon Airport:

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Imperial Airways used the Handley Page HP42/HP45 four-engined biplanes from Croydon, and the Armstrong Whitworth Atalanta, which was the first monoplane airliner used by the airline, intended for use on the African routes. In March 1937 British Airways Ltd operated from Croydon, moving to Heston Aerodrome in May 1938. Imperial Airways, serving routes in the British Empire, and British Airways Ltd, serving European routes, were merged by the Chamberlain government in November 1938 to become British Overseas Airways Corporation (BOAC). Larger four-engined monoplanes, Armstrong Whitworth Ensign series (G-ADSR) came into service that year.[citation needed]