实施缩小垂直间隔后,可用高度层数量增加,相应提高了空域容量。但空域容量增加后,机场和终端区的容量没有得到相应的提高,仍然是影响整个空域容量的瓶颈。在每个机场建多条平行跑道以满足不断增长的容量需求则受到经济、政治及环境因素的限制,并不现实。因此,近年来,国外开始着手 After the implementation of the reduced vertical interval, the number of available levels increases, correspondingly increasing airspace capacity. However, after the increase of airspace capacity, the capacity of airports and terminal areas has not been increased correspondingly, which is still the bottleneck affecting the capacity of the entire airspace. It is impractical to build multiple parallel runways at each airport to meet the ever-increasing demand for capacity, subject to economic, political and environmental constraints. Therefore, in recent years, foreign countries have started to work