sentences:  For a time he served as a pilot at the RAF Aeroplane & Armament Experimental Establishment (A&AEE) at Martlesham Heath.Convinced of the great future of civil aviation, he left the RAF in 1926 and engaged in air survey work in India, Burma, the Federated Malay States and Borneo, and he flew the first air mail from Borneo to the Straits Settlements.In 1928 he, with a partner, undertook one of the early long-distance pioneer flights, when they flew two de Havilland DH.9 aeroplanes from England to India.