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 I told him about getting out of the fog by way of a tail spin.

He certainly wasn't impressed favorably. "Suppose the fog had lasted all the way to the ground?" he asked.

I bring this experience up because of its important bearing both on the training of pilots and on flying in general; especially schedule flying. It is immensely important for a pilot to learn to fly by instruments, as distinct from flying "by horizon." The night flyer or the avigator in fog must depend upon his instruments to keep his course, equilibrium and altitude. It did not require the flight of the Friendship through long hours of fog and cloud to teach me the profound necessity of this.