National Airways are, in effect, corridors 10 mi wide within which civil aircraft flying in bad weather at heights between 3000 and 11, 000 ft are under control of ground organization; airways are divided into sections by radio markers on ground.
Completion of United Kingdom National Airways system
Engineer
Engineer ; 191 , n 4967
1951
Map
Aufsatz (Zeitschrift)
Englisch
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