IN 1937, when Imperial Airways and Pan American were conducting their flight surveys of the North Atlantic route with developed Empire boats and Sikorsky 42's respectively, and later, in 1939, when Pan American had just opened up their first scheduled Transatlantic Service with Boeing 314's, the design staff of Saunders‐Roe were engaged on the study of a flying‐boat to meet the same requirements.
Brennan, M.J. (1952), "Design and Development Aspects of the Princess: A Second Article Describing Some of the More Unusual Tests and Development Stages", Aircraft Engineering and Aerospace Technology, Vol. 24 No. 11, pp. 326-334. https://doi.org/10.1108/eb032225Download as .RIS
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