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 Trouble in the air is very rare. It is hitting the ground that causes it. Obviously the higher one happens to be, the more time there is to select a safe landing place in case of difficulty. For a ship doesn't fall like a plummet, even if the engine goes dead. It assumes a natural gliding angle which sometimes is as great as eight to one. That is, a plane 5000 feet in the air can travel in any direction eight times its altitude (40,000 feet) or practically eight miles. Thus it has a potential landing radius of 16 miles.

Sometimes, a cautious pilot elects to come down at once to make a minor engine adjustment. Something is wrong and he, properly, is unwilling to risk flying further, even though probably able to do so. Just so the automobile driver, instead of limping on with, say, worn distributor points, or a foul spark plug, would do well to stop at once at a garage and get his engine back into efficient working order.