The U.S. air lanes are getting too thick with planes. In the near future, most air traffic experts agree, something new will be needed to keep them from getting in each other's way. Recently the Air Transport Association of America described an ideal system for instrument designers to shoot at. It amounted to the sort of block system that railroads use.
Airliners now follow radio beams from airport to airport. By keeping on the proper side of the beam they can avoid collisions. But the beam system provides only a limited number of "lanes."...
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