在发达国家特别是美国,以私人飞机(包括直升机等各种飞行器,下同)为主体的通用航空,是与公共航空(同样是民营的)并驾齐驱的空中交通方式。在全美两万余个民用机场中,供定期航班使用的公共航空机场只有五六百个,其他基本上都是通用航空机场;在50多万架各种飞机中, In developed countries, especially in the United States, general aviation, which is dominated by private aircraft (including various types of helicopters and the same below), is an air traffic mode that goes hand in hand with public aviation (also privately operated). Of the more than 20,000 civilian airports in the United States, there are only about 500 or 600 public aviation airports for scheduled flights. The others are basically general aviation airports. Of the more than 500,000 aircraft of various types,