For about four years blind flying, now called instrument flying, has been a commonplace of U. S. air transport. Day after day planes ride the waves of radio beacons, staying unerringly on course when the pilot can see nothing beyond the cockpit window. But the radio beacon can guide a plane only to a point above its destination. If the airport is hidden by fog or sleet, the plane may crash. Hence the Government still forbids a passenger plane to fly into an airport where the ceiling is under 500 ft.
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