Specially Devised For The Modern Air Traveller
Detailed set of maps illustrating the routes of Scandinavian Airlines System and focusing on the SAS routes over the North Pole and the North Atlantic.
A fine description of the work of the Esselte Map Service and John S. Keates is provided by William Warntz of the American Geographical Society in Transatlantic Flights and Pressure Patterns; published in the Geographical Review, April, 1961, Vol. 51, No. 2, pp. 187-212:
Excellent examples of route maps are those provided by the Scandinavian Airlines System. The SAS maps, prepared by the Esselte Map Service, have been "specially devised for you, today's modern air traveller, to help you to enjoy and appreciate the lands you fly over and visit. Dominant landscapes and natural features of interest are portrayed in colour, and for this purpose the terrain has been studied in all its aspects, partly from detailed maps and partly by air observation. This cartographic impression of the earth's surface is achieved by taking an aerial view but employing colours as they might appear at ground level." Esselte Map Service Co. of Stockholm, Sweden, under the direction of Dr. Carl Mannerfelt, is a leader in cartographic development. The SAS route maps were supervised by Esselte's chief cartographic artist, John S. Keates, in conjunction with a team of geographers.