OVER a time span of some 20 years from now, S.T.O.L., V.T.O.L., and V/S.T.O.L. aircraft, having a wide variation in configuration, size and performance, may be expected to be developed. Over the same time scale, it is quite certain that the Air Traffic Control environment will change — considerably if it is to have any hope of catering for the new type of aircraft.
(1971), "Area Navigation and Air Traffic Control: The need for an accurate three‐dimensional navigational facility for the full utilisation of airspace in the future", Aircraft Engineering and Aerospace Technology, Vol. 43 No. 1, pp. 22-23. https://doi.org/10.1108/eb034715Download as .RIS
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