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 ground, with those in the air. The results are so different—as matters stand today. An automobile engine gives out. Normally the worst that happens is a stalled car, and some resulting inconvenience. Even if a wheel comes off the damage, and danger, is comparatively slight. But let an accident of similar magnitude occur in the air, and the consequences may be serious. Serious, that is, unless there is a landing field in reachable distance. And therein lies an outstanding problem of American aviation development.

During 1927 there were 482 municipal and commercial fields in the United States, with 56 under construction. In addition there were 53 army and 8 navy fields. Taking the whole lot, and adding the comparatively few in Canada and Mexico, it gives a pretty thin coverage for the continent.

While it is true that in some parts of the country, notably in the level areas of the west,