"Aeroplanes are not designed by science, but by art in spite of some pretence and humbug to the contrary. I do not mean to suggest that engineering can do without science, on the contrary, it stands on scientific foundations, but there is a big gap between scientific research and the engineering product which has to be bridged by the art of the engineer."

Next Quote

The aeroplane. . . is not capable of unlimited magnification. It is not likely that it will ever carry more than five or seven passengers. High speed monoplanes will carry even less. . . . Over cities, the aerial sentry or policeman will be found. A thousand aeroplanes flying to the opera must be kept in line and each allowed to alight upon the roof of the auditorium, in its proper turn.

— Waldemar Kaempffert