Chapter　2　 Improvement of Airports and Measures Against Noise and Safety Measures

(Improvement of Airports)

　 　 The civil airports which existed as of December 9th, 1975, included three Class I Airports (airports necessary for international air routes), 20 Class II Airports (airports necessary for major domestic air routes), and 43 Class Ill Airports (airports necessary for the maintenance of local air transport).
　 　 The improvement on the airports has been in execution by the Ministry of Transport under the Second Five Year Airport Improvement Program commenced in 1971 (Gross investment of 560 billion yen), of which the progress status is shown in (Table 3-(2)-1).
　 　 Projects for air safety facilities has made progress practically as planned, while, after the inauguration of the plan, there emerged an increased awareness of the environmental issues so that the anti noise projects have been carried out at a faster pace than originally planned at the same time causing a conspicuous delay in the construction of new airports and the expansion of the existing ones.