"It is about a period in aviation which is now gone, but which was probably more interesting than any the future will bring. As time passes, the perfection of machinery tends to insulate man from contact with the elements in which he lives. The 'stratosphere' planes of the future will cross the ocean without any sense of the water below. Like a train tunneling through a mountain, they will be aloof from both the problems and the beauty of the earth's surface."